I tried the hair drier method. Wroap the PS3 in a towel or jumper with an opening at the blu-ray side.Blast it with a hair drier on full for 5-10 mins. The whole console will get very hot and you may melt the trim but if you let the whole thing cool slowely then it should work well. Did for me and if it YLOD again then you can blast it with the hair drier again. I've done it 5 times now. The fix doesnt last forever and I suggest you take the outer casing off and clean out all the dust etc to prevent further over heating.