If you can get to the BIOS and display things then the MB POST'ed OK.
"I have a shutdown during boot problem" Download a bootable diagnostic (google ultimate boot disk, windows emergency disk, etc.). Build a USB or CD. Boot off it (f12 is typically the key to get a boot menu, or you can set the boot order in the BIOS). If it is stable, then windows problem. Fails, then post symptoms.
If Windows is failing during startup pull all the external cables except keyboard and mouse (no printer, no scanner, no firewire, no external drives, no mp3 players, etc) and see if you can get to safe mode.