My desktop PC has a problem. When it boots up I get a message saying keyboard controller failure, press F1 for help or F2 to run set up. Obviously, this is a really helpful message when the keyboard isn't working

I thought the keyboard itself had been on the blink for a while as sometimes it worked and other times it didn't. I've tried a different keyboard that I know works, but I get the same message. Is the PC goosed or is it an easy/inexpensive fix?
Any advice much appreciated.
Dave