PS/2 port working only in BIOS

LazerTechX · Jan 5, 2015

So, i have a PS/2 keyboard that I normally use, but when I had a USB keyboard to try out, I turned off the PC unplugged the PS/2 KB, and plugged the USB KB, I logged back in to Windows and tried it, but when I restarted the PC again, this time with my PS/2 keyboard, the keyboard did not work, I had to restart it. When I did, I pressed DEL to get to the BIOS, the keyboard worked fine, but when i'm in windows logon screen, the keyboard did not work at all. Is the port disabled in windows?

Moonstick2 · Jan 5, 2015

Have a read of the first answer here.

When a USB keyboard is added as a replacement for a PS/2 keyboard, the i8042prt service is forcibly disabled. This is to prevent a conflict between PS/2 and USB devices, but if a PS/2 keyboard is reinstalled, the service is not automatically restarted.

To switch back to using a PS/2 keyboard, the user needs to edit the Registry to restart the i8042prt service. To do this, in HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\i8042prt edit the Start value and set it to a hex or decimal value of 1. Reboot and change to a PS/2 keyboard via the Keyboards section in Control Panel.

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PS/2 port working only in BIOS

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