Moved computer, won't boot properly.

[Hessenth]

I recently took my computer to a friends for a LAN party and it worked fine when it was over there. When I moved it back home, it wouldn't boot properly. It wasn't dropped or damage or bumped in anyway at all. What it does is the following.

-Hit the power button, all the lights go on and everything seems to get power.
-The Video card seems to get power, but I get no display. When I removed the video card I realized that the GPU fan had been alot louder since the move than before.
-After about 5-10 seconds of beeing on, everything powers off. Then, 5 seconds later, it boots up again on it's own. This problem went away when I took the video card out.

I haven't tried another vid card because I don't have a backup card.

I've made sure that everything's plugged in right, and settled in correctly, and it still won't work.

Desperate for help!

[patio]

Unplug all power sources.
Remove a side panel.
Making sure you are grounded remove and re-seat the following 1 at a time:
RAM
Vid Card
Any other addon cards.

Then check and re-check all cable connections including both data and power.
Hook up the power, cross your fingers and power up.