Computer starts to boot then I loose video

Ok,
So the computer has been doing some funky things regarding video loss for a couple of months. I have swapped video cards, removed memory, switched memory and changed power supplies. The first issue that I started to encounter was the heat of the machine. If it reached 130 f I would loose video. After that point the ghost went away for a month or so then after I noticed the heat again I figured I'd checked the heat sync compound and reapplied some silver. Booted up and I'd get the bios screen and then I'd loose video again. It's like the power to the monitor goes as the bright green light goes from bright to dim. I've checked the monitor with another computer and it works fine. All of the replaced components lead me to believe that the mother board is going on me. Does any one else have any input regarding this ghost?

thx in advance!!

 

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