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Horrible sound on PC startup

Redthirst

For a few days now, my PC has some sort mechanical, grating noise coming from it on startup. Soundcloud link with a recording for reference

 

What's weird to me is that this sound only ever happens when I boot my PC up. It lasts for a minute or two and then it's gone and I never hear it while my PC is already working. Any ideas what it might be or some ways to diagnose it further?

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There is a good chance the fan bearings are worn out on one of the internal fans.

 

Not a big issue unless it is cooling something important.

 

You can open the case and disconnect one fan at a time and see what one makes noise. (Disconnect and reconnect fans with the system off.)

 

Once you find the noisy fan make sure to replace it.

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1 hour ago, Andrew 1337 said:

There is a good chance the fan bearings are worn out on one of the internal fans.

 

Not a big issue unless it is cooling something important.

 

You can open the case and disconnect one fan at a time and see what one makes noise. (Disconnect and reconnect fans with the system off.)

 

Once you find the noisy fan make sure to replace it.

Wouldn't a worn bearing be causing this noise every time the fan is spinning? I've never heard it outside of PC booting.

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Just now, Redthirst said:

Wouldn't a worn bearing be causing this noise every time the fan is spinning? I've never heard it outside of PC booting.

Not always after they heat up or get to speed they usually go silent.

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1 minute ago, Andrew 1337 said:

Not always after they heat up or get to speed they usually go silent.

Oh, I see, I'll have to check around, then. Thanks for advice.

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