PS4 not staying on

So I opened my PlayStation to clean it for the first time and when I reassembled it turns on for a couple while the the fan get really and then turns off after a couple seconds. Also when I opened it the thermal paste was dried but I don’t know if that is the problem and don’t want to buy thermal paste just for it not to work.

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It will not hurt to replace the older thermal paste. What I’ve seen from experience is loose cables or not tightening the chip clamp back down with right amount of pressure. If the APU doesn’t make good contact to the motherboard, then it will not turn on. Hope you already got this fixed.