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Pending OP Response Keyboard problem

When I boot up, (Dell Vostro 3471 Desktop) four out of five times I get "Keyboard not recognised" message and my passcode can't be typed in.

I've tried three good keyboards and I get the same message, I've changed the 3v battery ( the one I changed still had 3v's) I have also reset the BIOS to Default and done a hardware test and there are no problems.

Any ideas guys?