Keyboard not responding after OSX 10.7.4 update

I have just installed the OSX 10.7.4 update.
About 12 hours after installation the screen dimmed with a message that I need to restart the computer. I did so and now after startup I get a message on the screen that the Bluetooth keyboard can't be found. I actually have a hard wired keyboard, not a Bluetooth one, but there is no response to keys on the keyboard and I can't get rid of the screen message, even after a restart.
So I can't start in safe mode or anything like that because the keyboard doesn't work. Any ideas on how to get around this?

Thanks for the suggestions, but the keyboard was connected to a built-in port.
When I came back to the computer about an hour after the problem appeared, the bluetooth message had gone and the normal keyboard was working again, so I could log in. I checked Bluetooth in System Preferences and found there was a "phantom" wireless keyboard listed, that I had never installed. I removed that from the list so hopefully the problem won't re-occur.
Not sure whether this problem was related to the update, but from other posts, it appears to have caused a number of issues.

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