Keyboards and Mouse are Not Recognized

TESmart.01

Updated December 09, 2023 06:35

Keywords: KVM; USB; HDMI; Troubleshooting; Dedicated port;

Applicable product model: All of the KVM switches,

e.g.: HKS0401A1U; HKS0401A2U; HKS0402A1U; HKS0802A1U; PKS0802A10; HKS0403A1U, etc.

How to judge whether the keyboard and mouse are recognized by the computer？

On Windows 10 or Windows 11, you can quickly access Settings by pressing the Win + I key combination and then go to Devices Page to check if your keyboard and mouse are on the list.
On macOS, you can check the status of related devices by going to System Preferences > Keyboard & Mouse.

Keyboard & Mouse. "},"attribs":{"0":"*0+2y"}},"apool":{"numToAttrib":{"0":["author","7197958697937780737"]},"nextNum":1}},"align":"","folded":false}},"PAbldqhYCoASP2xaW3qciZaEnFh":{"id":"PAbldqhYCoASP2xaW3qciZaEnFh","snapshot":{"type":"image","parent_id":"FxuQdyMuaoeLbmxG7wzc5WmAnFh","comments":["7288614286468202524"],"locked":false,"hidden":false,"author":"7081078918781878275","align":"center","image":{"token":"D6BTbC5I5o4B64x2rPEcmjMqn0e","mimeType":"image/jpeg","size":286647,"scale":1,"width":1711,"height":831,"name":"img_v2_822b6c1a-ff3c-4f8d-b788-2ffb0000c49g.jpg","crop":[0,0,0,0],"rotation":0,"caption":{"text":{"apool":{"nextNum":0,"numToAttrib":null},"initialAttributedTexts":{"attribs":null,"text":null}}}}}},"TtZodYvPuoKm6SxaFsHcfC6Bnse":{"id":"TtZodYvPuoKm6SxaFsHcfC6Bnse","snapshot":{"type":"page","parent_id":"","comments":null,"locked":false,"hidden":false,"author":"7081078918781878275","children":["Od23dWJ85ohu0ixXeymcIF60nzc","QhCRdtVUaoXkbyxSdNzcwNV1nye","R2L8dmKm1oen25xPcT0cJBEWnxj","EmILd7ROIo0eHpx9RG7ckvjxnug","RrzJdQ9cYopuazxOpWGcy7menVd","XAYYdfqxxoJ5KfxxInycuSZAnyg","FxuQdyMuaoeLbmxG7wzc5WmAnFh","JW7Sd3KGQoGpB9xBHz4c7XVinic","K0R8dzIdFo4axtxRzHUcMy4snvb","VqbWdPmcRo5xRUxL8mNc5x7Bnnh","OI32dSRzQoiysKxnZa8c56yOnVx","F5medeJGwoUqbGxLu2ncKp4Hnzh","R8RFdrhRDoTjdrxhg4BcYzgYnOv","U0MUdb9SIo2ACTxRv0kcBgjon2b","P40advCR3oyEzUxMk5pcWnj9njb","Au1gdIDepo4E5HxJ9GWcKVKsnhg","Aef9dkswoonSpIx1e0AcSAGcn1b","PgAzdlzgboymnKxjqwNc632YnYb","PJTMdbIf6oH0ELxnJOpcswPonLb","VMaUdvceio4sSjx1pl8chZgjnkh","EwhVd9EsYocSrrx7IEnc4bIgnxh","Rfb3dUrDWocubsxutuQcjbmqnQc","Su82dqJI4ocNBDxIpntcu4x3nZe","UZ0cdlfYCoobPDxyyjKcc7ylnSc","Lfdxd4QeKoZNJ5xO5NMchxdrnac","DA8wdpwSHoXBYqxdoXdcgXC5nYd","Zc8PdFg3CoPDSNxjXGwc6MUWn3V","Fup9dbKFhon3USxgyJMcCAAunFh","RIqMdCmNloBYjhx4mklcxCTdnWe","DLKGdgeWkoG5Ioxx91IcDm2AnNN","EJgFdiN0LoBH1jxJ0dxcGO5xnae","JNJsdMWmpo7ZZmxOdh6cUTiBnfd","R7jbdM9JroHTS9xqhpicx6j6nrb","KycVdmGzxoQ0o3xWqHyczP0cnvg","K4PNdyksGot31MxswtQcn9osnKb","VyZOdfFduo0Dvfx13GDc05lanHe","XgsOd8kplowGO0x1g1scJSoEnQb","VRTjdDQOUoAv1wxEf1fcGdRIngh","URX6dWp3Co4un4xunxlc4JVFnBe","TrgCdUR0BoH9D1xYH8Xc7WI3n3F","TT3Ud1udtolqA3xYr89cRBSSnJf","MT2GdrGsgojinjxXDSucYEz6nRg","KwiZd8kOhoy5xfx55Lgcy4wen1g","GT1ZdtgyroodQNxL0B2ceBnXnae","AJ24dE1HLoxSg8xUOCjc4eNInzg","MZTjdMHRjoXoDkxr3t4cEn07nPd","QCr5dnYYno8OJexmk6OcnPzcn5e","E66hdZwEQoZNhuxhw80cpmMvnmd","NfY9dreuFoPRb0xZ7jOcU4yfnUb","TU8BduDOmowantxmU7Pc2z8inBg","QoT3dUu73oMY5ixQkEwcFBZon8c","LoysdTQCboxlNsx1zAocJyl1nPh","EtqTdnWLOoYODFxcth1c56L0nIg","PMm8dd1GwoL9xUxquspcZ7Gwnke","Qu3sd8Auqoe9plx7jExcPSVanzr","RXvbdxxfWoWMQXxOagCcicPEn9c","AHYEdgUHwoPKsKxVknrcJ5wNn0g","Bf5TdnDSGozou8xdGNOcNVPench","O1K3d1kFKoSGr1xSYiDcsiEdnAd","LjRPdFJq0oeQrHxGi8gcYn6PnJf"],"text":{"apool":{"nextNum":1,"numToAttrib":{"0":["author","7081078918781878275"]}},"initialAttributedTexts":{"attribs":{"0":"*0+12"},"text":{"0":"Keyboards and Mouse are Not Recognized"}}},"align":"","doc_info":{"editors":["7081078918781878275","7255106057608003588","7197958697937780737"],"options":["editors","create_time"],"deleted_editors":[]}}}},"payloadMap":{},"extra":{"mention_page_title":{},"external_mention_url":{}},"isKeepQuoteContainer":false,"selection":[{"id":6,"type":"text","selection":{"start":0,"end":75},"recordId":"RrzJdQ9cYopuazxOpWGcy7menVd"},{"id":7,"type":"text","selection":{"start":0,"end":182},"recordId":"XAYYdfqxxoJ5KfxxInycuSZAnyg"},{"id":8,"type":"text","selection":{"start":0,"end":106},"recordId":"FxuQdyMuaoeLbmxG7wzc5WmAnFh"}],"pasteFlag":"50b5b6ea-4506-4201-ac8a-2a9c59639e73"}" data-lark-record-format="docx/record" class="lark-record-clipboard"

K&M.JPEG

There are two specific scenarios that may lead to the keyboard and mouse not being recognized correctly, resulting in the inability to use any buttons or functions：

Situation 1: The keyboard and mouse you've connected to the KVM switch can not be used on any input source devices.

Situation 2: The keyboard and mouse you've connected to the KVM switch can not be used on specific input source devices.

You can check detailed troubleshooting recommendations for each of these situations below.

Suggestions for situation 1:

Check if the USB-A to USB-B cable cables are properly connected between the input source device devices and the KVM switch.

Firstly, Please make sure that each of your input devices has been connected to the KVM switch using a USB-A to USB-B cable. This is essential to ensure that each USB Channel between the input device and the KVM Switch can work normally to transmit keyboard and mouse signals. If the issue persists after connecting the cables, please proceed to the next troubleshooting step.

USB cable.JPEG

Confirm the keyboard and mouse compatibility.

Our KVM switches are compatible with wired keyboards and mice, as well as those with USB receivers. If your devices are exclusively Bluetooth-compatible, they may not work with our KVM switches.

Check if the Online indicator on the KVM Switch lights up after connecting the cables.

(Note: Some models may not feature an Online indicator on the front panel. In such cases, you can skip this step and proceed to the next one.)

KVM lights.JPEG

--If the Online indicator does not light up, it suggests a potential issue with the USB connection between the input device and the keyboard/mouse. To figure out the specific problem, please try the following steps:

If possible, please try a new USB-A to USB-B cable to connect and see if the Online indicator can light up.
Please ensure the distance from the input device to the KVM Switch does not exceed 2M. Because a longer cable connection may affect the stability of the USB signal transmission.
If the Online indicator still does not light up after the above operations, it may be the problem with the USB-B port or the Online indicator itself on the KVM Switch. In such cases, please contact us through the chat window at the lower right or by submitting feedback for further assistance.

--If the Online indicator is illuminated, it indicates that the USB cable is properly connected, and the USB signal between the computer and the keyboard/mouse is transmitted normally. You can proceed to the next troubleshooting step.

Check if the dedicated keyboard and mouse ports or USB 2.0/ USB 3.0 port is broken.

Please try to connect your keyboard and mouse to the dedicated ports and to the USB 2.0/ USB 3.0 port, and check separately whether the keyboard and mouse can work normally after connection.

Status 1:

Connecting to dedicated keyboard and mouse port--->NOT work

Connecting to extra USB 2.0/ USB 3.0 port--->Work!

It suggests a potential problem with the dedicated keyboard and mouse port or a compatibility issue for the keyboard and mouse. Please contact us through the chat window at the lower right or by submitting feedback for further assistance.

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Status 2:

Connecting to dedicated keyboard and mouse port--->Work!

Connecting to extra USB 2.0/ USB 3.0 port--->NOT work

It is possible that the USB 2.0/USB 3.0 port is defective. Please try connecting other USB devices to this port for testing. If others connected also do not work, please contact the TESmart Customer Service Center for further assistance.

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Suggestions for situation 2:

To troubleshoot the real problem in this situation where only certain input devices fail to recognize the keyboard and mouse, you can perform cross-tests using a working input device and available cables.

Please make sure that the USB-A to USB-B cables connecting the input devices to the KVM switch have been connected properly. If the issue persists, please proceed to the following troubleshooting steps.

USB cable.JPEG

Please identify and confirm which input device your keyboard and mouse can not work with normally, and which input port on the KVM this input device is currently connected to. And check if the corresponding online indicator lights up.

It has to be noted that if the KVM Switch you purchased does not feature an Online indicator, you can still follow this cross-test method. In such cases, pay attention to the functioning status of the keyboard and mouse after performing the operation.

Step 1: Attempt to ONLY interchange the connection ports on the KVM switch between the computers. Refer to the provided image for guidance. （Typically, the USB cable is bundled together with the HDMI cable, so they need to be exchanged simultaneously.）

Tip: Due to the current lack of clarity regarding your connection setup, we assume that one of your computers (referred to as Computer 1) is currently connecting to the "PC1" input ports on the KVM, and the keyboard and mouse can not work normally on this computer; Another computer (referred to as Computer 2) is connecting to the "PC2" input port on the KVM, and the keyboard and mouse can function correctly on this computer.

Computer 1--->"PC 1" input ports--->K&M Not Work

Computer 2--->"PC 2" input ports--->K&M Work

Please try to exchange the input ports connection to the KVM Switch. You can refer to the diagram below for guidance.

Result①:

Computer 1--->"PC 2" input ports--->K&M Not Work

Computer 2--->"PC 1" input ports--->K&M Work

The keyboard and mouse that were initially not functioning on Computer 1 continue to exhibit the same issue, while the keyboard and mouse that were working on Computer 2 remain functional.The test confirms that the USB-B ports on the KVM switch are functioning properly. The potential cause of the issue could be either the USB cable connected to Computer 1 or the USB port on Computer 1 itself. Therefore, further investigation is necessary.

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Result②:

Computer 1--->"PC 2" input ports--->K&M Work

Computer 2--->"PC 1" input ports--->K&M Not Work

The keyboard and mouse that were initially not functioning on Computer 1 are now working, while the keyboard and mouse that were working on Computer 2 are no longer functional.The issue has been identified as a faulty "PC1" USB-B input port on the KVM switch. Please contact the TESmart Customer Service Center for further assistance.

\"PC 2\" input ports---K&M Work "}}},"align":"","folded":false}},"CfFjdqb6MoSaWhxND2NcbEc9nhb":{"id":"CfFjdqb6MoSaWhxND2NcbEc9nhb","snapshot":{"type":"text","parent_id":"WyiAdEz5FoK6k2xHD0OcJgf7nWa","comments":[],"locked":false,"hidden":false,"author":"7197958697937780737","children":[],"text":{"apool":{"nextNum":1,"numToAttrib":{"0":["author","7197958697937780737"]}},"initialAttributedTexts":{"attribs":{"0":"*0+1c"},"text":{"0":"Computer 2---\"PC 1\" input ports---K&M Not Work"}}},"align":"","folded":false}},"EFcUdyvQkoMafRxtBx0cmbUPnYb":{"id":"EFcUdyvQkoMafRxtBx0cmbUPnYb","snapshot":{"type":"text","parent_id":"WyiAdEz5FoK6k2xHD0OcJgf7nWa","comments":[],"locked":false,"hidden":false,"author":"7197958697937780737","children":[],"text":{"apool":{"nextNum":0,"numToAttrib":{}},"initialAttributedTexts":{"attribs":{"0":""},"text":{"0":""}}},"align":"","folded":false}},"ZLwUd8Xkroc6LPxD32dcRjHEn6e":{"id":"ZLwUd8Xkroc6LPxD32dcRjHEn6e","snapshot":{"type":"text","parent_id":"WyiAdEz5FoK6k2xHD0OcJgf7nWa","comments":[],"locked":false,"hidden":false,"author":"7081078918781878275","children":[],"text":{"apool":{"nextNum":2,"numToAttrib":{"0":["author","7081078918781878275"],"1":["author","7197958697937780737"]}},"initialAttributedTexts":{"attribs":{"0":"*0+1q*1+b*0+1v*1+9*0+s"},"text":{"0":"The keyboard and mouse that were initially not functioning on Computer 1 are now working, while the keyboard and mouse that were working on Computer 2 are no longer functional. "}}},"align":"","folded":false}},"NRF1dpcOComr00x9nxrcwnpsnvg":{"id":"NRF1dpcOComr00x9nxrcwnpsnvg","snapshot":{"type":"text","parent_id":"WyiAdEz5FoK6k2xHD0OcJgf7nWa","comments":[],"locked":false,"hidden":false,"author":"7197958697937780737","children":[],"text":{"initialAttributedTexts":{"text":{"0":"The issue has been identified as a faulty \"PC1\" USB-B input port on the KVM switch. Please contact the TESmart Customer Service Center for further assistance."},"attribs":{"0":"*0+4e"}},"apool":{"numToAttrib":{"0":["author","7197958697937780737"]},"nextNum":1}},"align":"","folded":false}},"WyiAdEz5FoK6k2xHD0OcJgf7nWa":{"id":"WyiAdEz5FoK6k2xHD0OcJgf7nWa","snapshot":{"type":"callout","parent_id":"FJlFdFIxwoeOBqx4IqdcPZh7nCf","comments":[],"locked":false,"hidden":false,"author":"7081078918781878275","children":["IVijdIibFoWszzxzDPsc1V2AnYg","Jcrqdu18XoedVIxRLdQc4DGQn3g","CfFjdqb6MoSaWhxND2NcbEc9nhb","EFcUdyvQkoMafRxtBx0cmbUPnYb","ZLwUd8Xkroc6LPxD32dcRjHEn6e","NRF1dpcOComr00x9nxrcwnpsnvg"],"background_color":"rgb(255,245,235)","border_color":"rgb(254,212,164)","text_color":"","align":"left","emoji_id":"pushpin"}}},"payloadMap":{"IVijdIibFoWszzxzDPsc1V2AnYg":{"level":1},"Jcrqdu18XoedVIxRLdQc4DGQn3g":{"level":1},"CfFjdqb6MoSaWhxND2NcbEc9nhb":{"level":1},"EFcUdyvQkoMafRxtBx0cmbUPnYb":{"level":1},"ZLwUd8Xkroc6LPxD32dcRjHEn6e":{"level":1},"NRF1dpcOComr00x9nxrcwnpsnvg":{"level":1}},"extra":{"mention_page_title":{},"external_mention_url":{}},"isKeepQuoteContainer":false,"selection":[{"id":103,"type":"text","selection":{"start":0,"end":9},"recordId":"IVijdIibFoWszzxzDPsc1V2AnYg"},{"id":104,"type":"text","selection":{"start":0,"end":46},"recordId":"Jcrqdu18XoedVIxRLdQc4DGQn3g"},{"id":105,"type":"text","selection":{"start":0,"end":48},"recordId":"CfFjdqb6MoSaWhxND2NcbEc9nhb"},{"id":106,"type":"text","selection":{"start":0,"end":0},"recordId":"EFcUdyvQkoMafRxtBx0cmbUPnYb"},{"id":107,"type":"text","selection":{"start":0,"end":177},"recordId":"ZLwUd8Xkroc6LPxD32dcRjHEn6e"},{"id":108,"type":"text","selection":{"start":0,"end":158},"recordId":"NRF1dpcOComr00x9nxrcwnpsnvg"}],"pasteFlag":"50b5b6ea-4506-4201-ac8a-2a9c59639e73"}" data-lark-record-format="docx/record" class="lark-record-clipboard"

Step 2: Keep the result of Step 1 unchanged. Please try swapping only USB cables between computers.

See pic below for reference. （Typically, the USB cable is bundled together with the HDMI cable, so they need to be exchanged simultaneously.）

Tip: If the current status is the result① after Operation 1, which is that the keyboard and mouse do not work on Computer 1, while they can work normally on Computer 2.

Computer 1-->"PC 2" input ports-->K&M Not Work

Computer 2-->"PC 1" input ports-->K&M Work

Please try to exchange ONLY USB cables connecting the computers and the KVM Switch. You can check the pic below for guidance.

Result①:

Computer 1--->USB cable 2--->K&M Not Work

Computer 2--->USB cable 1--->K&M Work

The keyboard and mouse remain non-functional on Computer 1, while they can work normally on Computer 2. This means that the USB-A port on Computer 1 may be broken. To be more sure, you can connect this cable to another USB port on Computer 1.

USB cable 2---K&M Not Work"}}},"align":"","folded":false}},"IbUVd7DLQocFc5xJup3c6tVSnsh":{"id":"IbUVd7DLQocFc5xJup3c6tVSnsh","snapshot":{"type":"text","parent_id":"EoOVdFEWlocPFxxwEIfc6Y5jnnF","comments":[],"locked":false,"hidden":false,"author":"7197958697937780737","children":[],"text":{"apool":{"nextNum":1,"numToAttrib":{"0":["author","7197958697937780737"]}},"initialAttributedTexts":{"attribs":{"0":"*0+11"},"text":{"0":"Computer 2---USB cable 1---K&M Work"}}},"align":"","folded":false}},"Tsfhdo2Hio4GfHxB3tZcyq7Pn2g":{"id":"Tsfhdo2Hio4GfHxB3tZcyq7Pn2g","snapshot":{"type":"text","parent_id":"EoOVdFEWlocPFxxwEIfc6Y5jnnF","comments":[],"locked":false,"hidden":false,"author":"7197958697937780737","children":[],"text":{"apool":{"nextNum":1,"numToAttrib":{"0":["author","7197958697937780737"]}},"initialAttributedTexts":{"attribs":{"0":"*0+2v"},"text":{"0":"The keyboard and mouse remain non-functional on Computer 1, while they can work normally on Computer 2."}}},"align":"","folded":false}},"NeMGdr9iMo5uIlxMH8Yce4DjnAf":{"id":"NeMGdr9iMo5uIlxMH8Yce4DjnAf","snapshot":{"type":"text","parent_id":"EoOVdFEWlocPFxxwEIfc6Y5jnnF","comments":[],"locked":false,"hidden":false,"author":"7197958697937780737","children":[],"text":{"apool":{"nextNum":0,"numToAttrib":{}},"initialAttributedTexts":{"attribs":{"0":""},"text":{"0":""}}},"align":"","folded":false}},"OzsbdbmP5odfrjxoJngcPuvnnjh":{"id":"OzsbdbmP5odfrjxoJngcPuvnnjh","snapshot":{"type":"text","parent_id":"EoOVdFEWlocPFxxwEIfc6Y5jnnF","comments":[],"locked":false,"hidden":false,"author":"7197958697937780737","children":[],"text":{"initialAttributedTexts":{"text":{"0":"This means that the USB-A port on Computer 1 may be broken. To be more sure, you can connect this cable to another USB port on Computer 1."},"attribs":{"0":"*0+3u"}},"apool":{"numToAttrib":{"0":["author","7197958697937780737"]},"nextNum":1}},"align":"","folded":false}},"EoOVdFEWlocPFxxwEIfc6Y5jnnF":{"id":"EoOVdFEWlocPFxxwEIfc6Y5jnnF","snapshot":{"type":"callout","parent_id":"JAz8dem7VoQY0vxYisqcLFsunkX","comments":[],"locked":false,"hidden":false,"author":"7081078918781878275","children":["EmUZdlkYuo3qu0xfemGcQj9HnYf","M77bd5QDioKNbZx1WoNcMpQOn2d","BwkZdvdaLoef7ExxLBIcewDwn8e","IbUVd7DLQocFc5xJup3c6tVSnsh","Tsfhdo2Hio4GfHxB3tZcyq7Pn2g","NeMGdr9iMo5uIlxMH8Yce4DjnAf","OzsbdbmP5odfrjxoJngcPuvnnjh"],"background_color":"rgb(255,245,235)","border_color":"rgb(254,212,164)","text_color":"","align":"left","emoji_id":"pushpin"}}},"payloadMap":{"M77bd5QDioKNbZx1WoNcMpQOn2d":{"level":1},"BwkZdvdaLoef7ExxLBIcewDwn8e":{"level":1},"IbUVd7DLQocFc5xJup3c6tVSnsh":{"level":1},"Tsfhdo2Hio4GfHxB3tZcyq7Pn2g":{"level":1},"NeMGdr9iMo5uIlxMH8Yce4DjnAf":{"level":1},"OzsbdbmP5odfrjxoJngcPuvnnjh":{"level":1}},"extra":{"mention_page_title":{},"external_mention_url":{}},"isKeepQuoteContainer":false,"selection":[{"id":113,"type":"text","selection":{"start":0,"end":9},"recordId":"M77bd5QDioKNbZx1WoNcMpQOn2d"},{"id":114,"type":"text","selection":{"start":0,"end":41},"recordId":"BwkZdvdaLoef7ExxLBIcewDwn8e"},{"id":115,"type":"text","selection":{"start":0,"end":37},"recordId":"IbUVd7DLQocFc5xJup3c6tVSnsh"},{"id":116,"type":"text","selection":{"start":0,"end":103},"recordId":"Tsfhdo2Hio4GfHxB3tZcyq7Pn2g"},{"id":117,"type":"text","selection":{"start":0,"end":0},"recordId":"NeMGdr9iMo5uIlxMH8Yce4DjnAf"},{"id":118,"type":"text","selection":{"start":0,"end":138},"recordId":"OzsbdbmP5odfrjxoJngcPuvnnjh"}],"pasteFlag":"50b5b6ea-4506-4201-ac8a-2a9c59639e73"}" data-lark-record-format="docx/record" class="lark-record-clipboard"

Result②:

Computer 1 --->USB cable 2--->K&M Work

Computer 2 --->USB cable 1--->K&M Not Work

The keyboard and mouse can work on Computer 1, while they become non-functional on Computer 2. This means that USB cable 1 is faulty. You can fix this problem by replacing this USB cable with a new one

All the above steps are designed to troubleshoot the real problem that affects your normal use of the product. If you have confirmed the problem after certain testing steps, please contact the TESmart Customer Service Team through online chat or email and explain the troubleshooting you have done. Then they will help you solve the problem ASAP.

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Keyboards and Mouse are Not Recognized

How to judge whether the keyboard and mouse are recognized by the computer？

There are two specific scenarios that may lead to the keyboard and mouse not being recognized correctly, resulting in the inability to use any buttons or functions：

Suggestions for situation 1:

Check if the USB-A to USB-B cable cables are properly connected between the input source device devices and the KVM switch.

Confirm the keyboard and mouse compatibility.

Check if the Online indicator on the KVM Switch lights up after connecting the cables.

Check if the dedicated keyboard and mouse ports or USB 2.0/ USB 3.0 port is broken.

Suggestions for situation 2:

To troubleshoot the real problem in this situation where only certain input devices fail to recognize the keyboard and mouse, you can perform cross-tests using a working input device and available cables.

Please make sure that the USB-A to USB-B cables connecting the input devices to the KVM switch have been connected properly. If the issue persists, please proceed to the following troubleshooting steps.

Please identify and confirm which input device your keyboard and mouse can not work with normally, and which input port on the KVM this input device is currently connected to. And check if the corresponding online indicator lights up.

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