So the strangest thing happened today....

I was playing some OW and suddenly my game and then my PC froze, the only thing I could do was do a hard restart. When the PC booted back up it gave me a error "Overclocking Failed" and "Press F1 for Setup". I had my PC built for me and know nothing about Overclocking so I turned it off and called a friend - he wasn't sure an asked me to turn it back on and read him everything it said, but this time my PC started perfectly. No problems at all.

What could have been the cause of this and should I be worried? Or was it just a weird one off occurrence?

Cheers
Panda