a PS3 is essentially a computer, same dust rules apply, same heat issues apply. Since it is no longer warrentied. I'd go buy a can of compressed computer air, open up the case, and blow everything out until there is no more dust. IF that fixes it, great. If it doesn't you have bigger problems and your options are basically try and find a parts donor and replace the power regulator and video modules and hope for luck, or buy a new one. You could possibly just have a dead fan. if so, you can get a replacement unit of the same size from performance-pcs.com.