Windows 7 keyboard problem

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.
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  1. 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
  2. Also, what motherboard do you have? I know some AsRock mobos have had such problems which were fixed through BIOS updates.
  3. update drivers from website
  4. I discovered my Asus mobo has both USB 3.0 and 2.0. I had the keyboard plugged into a 3.0. Plugged into a 2.0 and now it works great.

    I always thought a 3.0 would allow for an older version.
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