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I just finished cleaning my ps4’s heat sink and fan because it had been overheating during a game, but now I can’t even get into a game without it shutting down. The fan start going very fast, then I get a message saying that it is too hot, then it shuts down. I thought cleaning was supposed to help not make it worse. If someone knows why, please let me know.

Hello, many people forget to replace their thermal compound after cleaning the device. I would clean off the original compound and replace it with a better one any ways. I use thermal grizzly kryonaut personally but there are many compounds that are recommended for this applications. Also, make sure that all the thermal pads that sit on top of the memory chips are in tact.