[Solved] Radeon 4870 White screen

Hello All.
I recently posted here a couple of weeks ago to for a new computer build. I received all the parts, assembled them, and installed windows xp. Everything was running great until I tried to play Borderlands. Within five minutes of jumping in-game my screen goes completely white and I have to reboot the computer. I thought this was a borderlands specific problem until I was playing L4D and had the same problem. I am running at stock speeds with not tweaks on anything.

AMD Phenom II X2 550 Black Edition Callisto 3.1GHz Socket AM3 80W Dual-Core Processor Model HDZ550WFGIBOX
G.SKILL 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Dual Channel Kit Desktop Memory Model F3-12800CL9D-4GBNQ
GIGABYTE GA-MA770T-UD3P AM3 AMD 770 ATX AMD Motherboard
OCZ ModXStream Pro OCZ500MXSP 500W ATX12V V2.2
Western Digital Caviar Black WD6401AALS 640GB 7200 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive
SAMSUNG CD/DVD Burner Black SATA Model SH-S223C
XFX HD-487A-ZWFC Radeon HD 4870 1GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card

Also I have my drivers up to date as far as I know.

Thanks!