Every once in a while, my eMachines fan kicks up, kind of like the cooling 
fan on a car engine, even after the car is turned off. I figure it's the 
same thing. Either there is an extra fan that kicks in when the case temp 
goes up, or there is a two speed fan. At least that has always been my 
assumption. Could I be wrong?

It has done this since the unit was new and I don't have any operational 
issues. Insight?

William Closure


----Original Message Follows----

Date:    Wed, 20 Sep 2006 00:11:04 -0700
From:    David Gillett <[log in to unmask]>
Subject: Re: Friends PC has a problem

On 18 Sep 2006 at 20:26, Dave Schroeder wrote:

 > "After my PC has been on a few minutes, the humming is so loud I hear
 > it several rooms away.  Then it revs up like it's going to take off,
 > then backs down.  I know that's not right.  "

   Hard drives and fans generally run at a constant speed, and so their 
noise
tends to be constant too.  This "rev up" sounds like what some machines I've
worked with do in order to determine what CD/DVD (or, occasionally, floppy)
is in a drive.

David Gillett

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