So I recently was given a Toshiba Satellite A75-S211 and it would shut off after enough time running, and eventually I discovered it was because of overheating. I even propped it up so the fans were not blocked, but to no avail. The guy that gave it to me said that even a cooling pad didn't work for him. The fans are not blocked, I can see both running on the bottom. Any ideas as to why this is overheating?
Aside from making sure the heatsinks are free of dust build up you will probably need to change the thermal paste. Over time it dries out and fails to transfer the heat well. Artic silver 5 or tuniq tx-2 are good choices. If the fans are running, heatsinks are seated right and dust free then change the paste, that should solve your problem.
You can try blowing any dust or fluff out with a can of compressed air or even blowing into a straw or similar. I prefer to look inside but that's not essential if the blowing does the trick.
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