I would try zapping the PRAM; and reset it from the little button on  
the motherboard.
Reseting everything to the default might fix your problem... If not, I  
don't think I'd run it too often.... or lean over the back a lot...


Elliott


On Nov 25, 2009, at 5:51 PM, Wolfman wrote:

> I have this G3 400 MHz iMac slot load computer.  I paid a few bucks
> for it and I made the mistake of meeting the seller and not actually
> seeing the computer run but I was assured it was OK.  I have had lots
> of iMacs but I have never heard one with such a loud buzzing noise
> that appears to be coming from the back of the machine.  Bad CRT or
> power supply?  I have no real what idea what is going on.  It boots up
> fine and I can see all the files so I am pretty sure it is not the
> hard drive making this noise.  Any ideas?
>
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