Posted 14 September 2009 - 07:23 AM
Was there a reason you performed the BIOS upgrade?
It does sound like an overheating problem, but the CPU, if that is a correct temperature reading is not the problem.
The BIOS are not stored on the hard drive with the OS. They are actually burned to a chip =ROM, Read Only Memory, on the motherboard. If it is a bad or incorrect BIOS flash then a System Restore or re-install will be of no use.
As stated, you can try a re-flash to the previous version.