I have a USB keyboard and mouse (combo thingy). I can not use the USB keyboard and mouse when trying to enter setup, boot menu, or anything like that becasue Windows needs to load the driver for it, which it can't do at that point. My motherboard does not support the old PS2 keyboard, so I'm pretty sure I can't use my old keyboard. What do I do? All I really need to do is enter Linux instead of Windows for a little bit (I am dual booting)
Unplug the usb keyboard from the computer, power the computer down completely and remove the power cord/switch the power switch on the power supply wait 30 seconds plug in power, usb, and try rebooting The usb keyboard should work now, if not, you'll need a different keyboard. USB ports sometimes stay active even when the computer is shut down, so you have to do a cold boot to get them to reactivate themselves on bootup to detect a keyboard. You could try another usb port too.