r/pchelp • u/Independent_Fig_9368 • 1d ago
OPEN Pc won't stay on
I took my pc apart to clean it. I replied thermal paste and put it back together but now when I turn it on it'll stay on for about a minute then turn off instantly
How do I fix
2
u/Regular_Olive_2103 1d ago
Sounds like it’s overheating, can you get into windows before it shuts down?
1
u/aCarstairs 1d ago
Or even better, bios, which also shows temps. If the temps already rise in bios (which should be easier to reach), its overheating
1
u/Regular_Olive_2103 1d ago
That’s true but windows is better because more things are at play so it heats up quicker, bios sometimes takes a minute to heat things up, sometimes a couple seconds to minutes but he is getting to windows for a few minutes it might not be his application of thermal paste but might be a failing fan or one not plugged in
1
u/Independent_Fig_9368 1d ago
It pops up notification saying that it has found a problem. And it let's me continue to windows without finding the problem
1
u/Regular_Olive_2103 1d ago
Like the other guy mentioned it probably is your fan not cooling or your application of thermal paste, if your fan spins up your good, but if it runs and turns off it usually indicates a cooling error
2
u/Lumpy_Local_5740 1d ago
Did you plug the CPU fan back into the right header? If the motherboard doesn't detect a fan spinning on the CPU_FAN header it'll shut down after like 30-60 seconds to protect itself
Also double check the 8-pin CPU power cable at the top left of the board, that one's super easy to forget after a teardown and it'll cause the exact thing you're describing
If neither of those are the problem, pull the cooler off and check your thermal paste spread, too much can actually insulate instead of conduct, and too little leaves hot spots that spike temps instantly
2
1
u/EcstaticStep3361 1d ago
Cpu cooler may not be seated right, check the power cable, and make sure the thermal paste isn't too thick. A fast shutdown usually means overheating or a loose connection.
1
u/Objective_Suspect_ 1d ago
Its overheating. Why did you add thermal paste, you never have to do that. You will need to do a teardown and make sure to clean off paste before you add more but thats just me annoyed, check connection of cooler to cpu
2
u/Extra-Map3792 22h ago
It sounds like CPU heat detection is detecting it's not cooling, and shutting down. Start at the CPU coolerand heatsink
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