Gigabyte mobo?

I have a tower that failed in the middle of composing an email displaying a totally garbled screen. The tower would not re-boot, failed to load system repair disk, fails to run hiren self boot option programs for diagnosis.

I get the feeling that either the bios has failed or the mobo has component failure? On attempting to run Mini XP from hiren 13, I get a bsod with this-

Stop: 0 x 0000007F (0x00000000 0x00000000 0x00000000)

Currently, won't boot at all into bios?

Win7 Pro 2GB, Intel 945 S-Series (Intel Core Duo Processor)