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I took my ps4 completely apart cleansed the entire inside the fan and heatsink and all dust inside but once I turn it on it makes a loud fan noise and then when I load a video game up it gets louder and shuts off in like 25 secs

Hi Raymond, Did you separated the motherboard from the heatsink?? If yes, you should replace the thermal paste! Without it or with the “old” used thermalpaste it could overheat easily. And when you are there, make sure all the cables are plugged in. Guide Thermalpaste: How to Apply Thermal Paste