Just installed Win7 on a brand new system. USB keyboard not responding. Found similar posts online. Was using PS/2 keyboard with no problems. Thought I would try the USB keyboard again. Now neither will work. Neither will allow me to go into bios. The PS/2 keyboard flashes the NumLock CapsLock and Scroll Lock lights repeatedly.
Don't know what else to do.
More aboutwindows keyboard problem
is your usb keyboard in a usb 3.0 port?
if so plug it into a usb 2.0 port
and preferably a port at the rear from the motherboard
Also, what motherboard do you have? I know some AsRock mobos have had such problems which were fixed through BIOS updates.