Fedora Users — Keyboard not responding

I've just started using Linux in the last week or so. I got FC2 up and running without any problems, uptime of about 5 days or so, then I get home from work and my keyboard is not responding. My first instinct was to reboot; my X session closes and I get the following:

INIT: Switching to runlevel: 6
INIT: Sending processes the TERM signal

Then... nothing. The system just hangs. I had to reset, logged back in and everything seemed to be working properly, I went to bed, woke up this morning and again, no keyboard. Try to reboot and system hangs again.

Now, unfortunately as I am new to Linux I have neither an idea what the problem may be nor do I even know how/where to start looking. Anything pointing me in the right direction would be much appreciated.

Cheers,
J