the problem was a YLOD.(turn on 3 beeps , quick yellow light then it would shut off)
to fix it it
- i completely disassembled the ps3. so that i could remove its main board.
- cleaned off all the thermal paste from the cpu and gpu (as well as bottom of the cooling block).
- covered a circular baking pan in aluminum foil, put the board on the foil and covered the board with more foil. leaving the area around (and including) gpu and cpu exposed more directly to the heat
- placed it in my oven. turned the oven on to 375 deg F.preheat w/ the board in the oven so it all evenly heats to prevent cracking. after it reaches temp "cook" for two min. let cool ~15min. (do not touch it)
- reassembled the ps3 be sure to put new thermal paste , i used Arctic silver 5 .
if you look on youtube for ylod fix you will see lots of ppl do this with a heat gun or blow dryer. or use much higher temps / longer "cooking" time, the thing that matters the most is that the solder is heated enough to become a liquid but not to long or you will start to melt the plastics on the board or do things much worse, like start to pop capacitors (this is also why we cover everything to keep it out of the more direct heat). hope that helps you. just be warned that your issue will prolly comeback sometime, its hard to say cause it depends on use and how hot the chips get it will come back sooner if you don't use the thermal paste correctly.