I've got a slot cd iMac 400mzh that isn't the quiet anymore. Seems
to have a whine that's pretty annoying. Surfed the net and got
some advice on determining if the sound is emanating from the HD
or CRT. Used the energy saver control panel to test both and found
out that they aren't the problem. Before I start mucking around
the inside of the machine, I figured I'd subscribe to this list
and see what you folks would recommend.
I think my original post may have gotten entangled in the top/
bottom thread. I've heard from Kari with some advice. Anyone else
can to wade in with a thought?
Bob
Try substituting another hard drive for the one in your iMac.
Disconnect your hard drive and boot from the optical drive.
Disconnect the optical drive and boot from the substitute drive. If
none of those pinpoint the source of the sound, then you've got
electronic parts on the PAV boards that are emitting the sound.
There's a lot of difference between a whine, which is the word I use
to describe a noise made by a rotating part, such as a hard drive
bearing, and a squeal, which is the word I use to describe
oscillations of an electronic part out of specs on the power, analog
or video boards. This latter is not uncommon in electronics devices
that have seen years of use.
If you've eliminated the drives, then the next thing to do is
substitute known quiet PAV boards for the original until you get to
the noisy board. But that's a lot of work, so first try to find the
noise. To do this, remove the outer casings. Then using a directional
listening device, carefully and slowly move the device around the PAV
area and the CRT until you find the offending part. I use an old
airline headphone set which has plastic tubes for channeling sound
rather than a wire. A simple flexible or plastic tube that will fit
in one ear also works; put a plug in the other ear so that all that
you hear comes in through the tube.
CAUTION: Do not touch or even get close to the CRT, the PAV or any
wires while you're doing this. It could cost you your life or a stay
in the hospital.
Once you've found the noise source, remove and replace the part or
the board. If you're at all uncomfortable or feel incompetent to do
the repair, then by all means get a professional to do it. There's
lots of dangerous electricity in the CRT and PAV even when the iMac
is turned off and unplugged.
HTH,
Jim
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