Question PC making grinding sound on cold startup

Jan 27, 2021
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Hey, recently everytime i startup my pc on a cold startup (usually overnight) my pc makes a super loud grindy sound for around 5 minutes before going down to its normal noise, listening to my pc closely and stopping fans, I think its coming from the radiator of my AIO. I've searched everywhere and I've tried things such as tilting the pc/laying the pc down and tapping on the AIO, I've laid the pc down overnight as well and its still an issue, is there a fix to this without potentially buying a new AIO?
 
Jan 27, 2021
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My first though is the bearings on one of the fans on the AIO is going.
You probably can replace just the fan....but I would do both....and you might find them on EBay. I find a lot of different fans on EBay.
I've verified its not the fan
 

Mtop

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Nov 21, 2019
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Cold loose - Hot tight
All I can think of is the bracket for AIO, the CPU clamp
Nothing wrong there you may have an AIO going bad - pump bearing? air bubbles?
 

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