I bought gigabyte GA-MA785GM-US2H AM3 AT mother board, AMD Athlon II X3 635 quad core CPU, Hitachi 1TB 7200 RPM SATA, 2GB(2x2) OCZtech DDR2 pc2-6400 mem, and toshiba 22x cd/dvd rom and put them together. The system comes up ok ( can go into the bios and can see the boot process). When I try to install the OS (boot from the CD) (tried both windows vista and ubuntu linux (64 bit server edition) CD's, the installation process starts and immediately the screen goes black (or some sort of blinking black and white) and I cannot see anything. The system hangs and have to switch the power off. Any help is much appreciated.