Your motherboard is like mine, older than dirt. Your most recent bios update is from 2007 (also like mine). Everytime I attempted to update the firmware on my agility 3 i got the BSOD. I ended up having to install a fresh copy of the OS to a different drive and use that to then go in and update the firmware. Luckily, it finished the update right before the typical bsod.
Swap out cables and check connections to rule out that possibility. Try resetting your cmos by jumper pin or removing the battery set everything up again and try again. Make sure you have the latest drivers for the chipset/motherboard. You could try updating from a fresh install of the operating system if you have a spare disk around. You can try updating the firmware from a friend's or neighbor's computer. You could also seek help from a local computer shop.