Over the last few weeks, when I switch my system on, occasionally the fans spin and the lights come on but nothing happens . When I have got it to POST it says

Overclock failed!
Press F1 to run setup.
Or Press F2 to reset to default values.

if it did not POST the previous time. Otherwise it boots as normal without this message.

This first occurred after it was moved upstairs to my room. Although none of the components seem loose or damaged in any way.

I cannot get it to work at all today so I am assuming that it has packed up.

The system has been rock solid for 2 & 1/2 years and is as follows:

P4C 3.0GHz
ASUS P4C800 Deluxe
1GB Crucial Ballistix 2-2-2-5
ATI Radeon 9800 Pro 128MB
Audigy 2
80GB Western Digital 8MB Cache Hard Drive
Razer Diamondback Mouse
Windows XP

I suspect it is a motherboard problem but I wonder what you think, and what should I do about it?

Also, I got it to boot one more time and it restarted after about 5 seconds and just went to a blank screen.