Dead computer Troubleshooting

[Roger45]

My 1 year old computer died, and I have been trouble shooting what happened (not the one in my sig line). I have a MSI 770G45 Mobo (which died the first month and I previously replaced) with an AMD Phenom II Black Edition 965, 8 of RAM, and a radeon Video Card. I have used this machine literally for hours playing Crisis II at a very high resolution without any problems. Down loaded grand Theft Auto IV and was playing it for about 30 minutes and my computer went black...power light was the only thing on. I then noted a burnt electrical smell.

I let the computer stand for about 3 hours. Took canned air to everything. Booted up the machine and it went through the whole boot process, but when all the tasks in the task bar were complete, it went black again. Booted fine into the BIOS, which showed the CPU temperatures rising to 45C in about 5 minutes. So I replaced the cooler with a Corsair 60 water cooler. This did not help.

Took it to a shop for diagnoses. Tried four different video cards, no change. Tried different memory, no change. Tried a different power source, no change. They noted that the black out/turn off was happening faster with each attempt to re boot until it would not even boot into the BIOS.

I bought a new MoBo...ASUS Sabrtooth 990FX and I get a Power Light on the MoBo. When I turn it on, nothing comes up, and it shuts itself off in 3 seconds.

My guess is that I originally fried my MoBo. I think the shop, in trying to diagnose the problem, most likely fried my CPU by trying to re start the system over and over when the MoBo was fried. Does that sound right? Am I missing anything else? Any input is appreciated.