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 Post subject: what is that vibration hum noise?
PostPosted: Sun Nov 23, 2008 2:19 am 
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Joined: Sun May 23, 2004 5:42 am
Posts: 32
My computer is very quiet. It's got all the quiet components. I can hardly hear it.

But there's a strange noise, and I don't know where it's coming from.
The noise is a hum or vibration kinda noise and its periodic. It happens every 1 or 2 seconds. It is constant and the volume gradually raises and fades, as if u were to turn a volume knob very slowly up and down.

I noticed this on other computers too. On some it happens every 10 seconds. The whole case just starts vibrating for a few seconds, then it goes away.

I tried puting the case on top of soft material so the floor doesn't absorbe the vibration. But I can still hear it.

Is this coming from the power supply? It cannot be the hard drives, because I have 5 and they are all very quiet.

Any tips?

Thanks


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 Post subject:
PostPosted: Sun Nov 23, 2008 2:21 am 
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Joined: Sat Mar 17, 2007 3:17 am
Posts: 780
Location: Croatia
It's the hard drives.


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 Post subject:
PostPosted: Sun Nov 23, 2008 2:33 am 
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SPCR Reviewer

Joined: Sun Sep 21, 2003 11:23 am
Posts: 1847
Location: Vancouver, BC, Canada
Congratulations, you've got beats ... or multiple hard drives whose rotation speeds are moving in and out of phase with each other. The solution is to soft-mount the drives so that the vibrations are no longer transmitted to the structure of the case, and therefore no longer resonate. There are plenty of examples of drive soft-mounting in these forums ... just do a search.


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 Post subject:
PostPosted: Sun Nov 23, 2008 2:45 am 
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Joined: Fri Mar 04, 2005 9:07 pm
Posts: 1041
Location: Vancouver
http://www.silentpcreview.com/forums/viewtopic.php?t=19147


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 Post subject:
PostPosted: Sun Nov 23, 2008 3:08 am 
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Joined: Sun May 23, 2004 5:42 am
Posts: 32
thanks.

you're right..

in my other case all these hard drives were hanging on ropes, and this vibration didnt happen.


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 Post subject:
PostPosted: Sun Nov 23, 2008 4:23 am 
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Joined: Tue Jan 08, 2008 5:09 am
Posts: 397
Location: Copenhagen, Denmark
Wow, 5 hard drives? You need to rig up some serious soft-mounting, but good luck from me. :)

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