It might be that you have a usb keyboard.
Borrow a usb 2 PS/2 adapter....boot into bios and check ....usb legacy support.
or borrow a real PS/2 keyboard.
Naturally ignore me if you have already enabled usb legacy support.
eg for a MSI motherboard manual I have
Quote:
fLegacy USB Support [Enabled]
Sets Legacy USB function support.
[Auto] The system will automatically detect if any USB device is connected
and enable the legacy USB support.
[Enabled] Enable the USB support under legacy mode.
[Disabled] The USB devices will be unavailable under legacy mode
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