Bre901,
As timmcat says, it could be a bad Vid Card. It could also be one of your PCI/AGP Cards or RAM that has slightly popped out of its slot and just needs to be pushed back down.
I would first try opening the case and pushing them cards back down, if that does not do it, then I would remove the power cord from the power supply and the battery from the motherboard, wait a good 15 to 20 minutes before putting them back, and see what happens.
Take Care,
Richard