Red Ring Of Death

You need to do the x-clamp-fix go to the x-clamp-fix.com or google those key words and you will see how to fix it.

Basically you have to remove the clamps that hold the heat sinks and use some screws, bolts and washers to hold it down tighter insteas.

See what happens is the motherboard becomes so hot that it warps in the middle, when this happens the solder looses and has no contact, this causes the rings of death, so the idea with the fix is to raise the board and prevent it warpping, this fixes the red ring of death.