I had the same problems with my 60GB launch PS3 and when I opened it up the problem was plainly obvious, the thermal paste had gone bad
after I exchanged it with high quality paste (I recommend arctic cooling MX-2 or MX-3 paste) it ran perfectly again
for a guide to open up the PS3 and how to apply paste plz watch the ylod guide from Gilksy
(part 1 of 6) http://www.youtube.com/watch?v=U70SgRDVcBo







