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User profile for user: itskyb
itskyb Author
User level: Level 1
4 points

Mac Mini M4 USB Keyboard/Mouse Issues with KVM

I upgraded from my Mac Mini M1 to the M4. I have a TESmart KVM switch which worked flawlessly with my old M1 Mac Mini and the three other PCs that I have connected to it. The M4 recognized my trackball and keyboard for about 10 minutes. Ever since then, nothing, NADA. I'm about ready to send this thing into space or sell it. I have tried using a USB hub, USB-A to USB-C converter, and have tried all five USB-C ports on the M4. Nothing works. It is beyond frustrating. Anyone else having this issue?

Mac mini, macOS 15.2

Posted on Jan 21, 2025 12:12 PM

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2 replies
User profile for user: XeroMaster
XeroMaster
User level: Level 1
36 points

Jan 21, 2025 9:46 PM in response to itskyb

That sounds frustrating! Here are a few steps to get your keyboard and mouse working with the KVM switch on your M4 Mac Mini:

  1. Check macOS Settings:
    • Go to System Settings > Keyboard and Mouse, and see if they’re being detected.
  1. Power Cycle the KVM:
    • Disconnect the KVM from power for a few minutes. Reconnect it and make sure your Mac Mini is on the correct input channel.
  1. Update Firmware:
    • Check if TESmart has a firmware update for your KVM switch. An update may resolve compatibility with newer Macs.
  1. Direct Connection Test:
    • Connect the keyboard and mouse directly to the Mac Mini (bypass the KVM) to confirm they work fine.
  1. Try Different Cables:
    • Use high-quality USB-C to USB-A cables or hubs for the connection.
  1. Reset SMC/NVRAM (if applicable):
    • Shut down your Mac Mini, unplug it for 10 seconds, then restart.

If it still doesn’t work, TESmart or Apple Support might have insights. Hope this helps!

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User profile for user: itskyb
itskyb Author
User level: Level 1
4 points

Jan 22, 2025 2:29 AM in response to XeroMaster

Thanks XeroMaster for the reply.


  1. When using the KVM, I cannot log in as the keyboard and trackball do not work.
  2. I power cycled many times, no luck unfortunately.
  3. I did check for that and there doesn't appear to be one.
  4. Direct connect works, but then that defeats the purpose of having a KVM switch.
  5. I tried a different port on the KVM, no difference unfortunately
  6. I will give this a try as it will be the last effort before I sell the mini.
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Mac Mini M4 USB Keyboard/Mouse Issues with KVM

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