PSU fan Noise

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Joined
8 Apr 2009
Posts
1,878
Location
Manchester
I opened my system up to replace a fan and noticed a slight knocking sound coming from the PSU fan you cant hear it if the case is closed if I didn't listen closely I wouldn't even know it's there. Only seems to happen when I turn the system off and last for a minute or so.

Can't remember if it always did this, is it normal?
 
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