I changed the hard drive a month ago and updated to WinXP.

It is a pc I built in 2004- P4/2.5 with ECS motherboard (L4....)

Its been working fine - I shut it down last night and it doesn't boot today.

The light comes own and I hear the fan. I don't hear a "clicking" sound - Monitor is blank - No BIOS appears on the monitor.

What is happening?