Computer Will Not Start

Hey,

today I was switching monitors for my computer, didn't want to bother turning the computer off before I did so I just plugged it out and plugged the other monitor in. Got no signal, so I went to reboot with the reboot button but it wouldn't work. So I shut it down by holding the power key. It turned off alright, but now it won't turn on no matter how many times I press the key. I don't think it's the power supply because the Standby Power LED on the mobo is lit, although I have been hearing increased noise from the A/C fan for the past month or so.

My specs are:

ASUS P4PE Motherboard
Intel Pentium 4 1.8GHz CPU
PC2700 512MB RAM
MSI Ti4200 GEFORCE4

Any ideas?

 

try clearning your BIOS and seeing if it will turn on then