Have you tried replacing the batteries? (PRAM)battery death can cause
a black monitor. Theyre relatively cheap to replace, like $5. Since these
are at least 3-yr old computers, the batteries could well be going out
If that doesnt help, I would say sounds like a bad power supply as you
describe it, but I'm no tech expert.
You could pull the logic board/cd drive assembly from one of your "dead"
imacs and swap it into a working one. If it works, you know the
problem's not in that part. Follow the initial instructions in the
memory installation procedure to get them out
http://www.info.apple.com/support/cip/imacorig-memory1-cip.mov.html
(for orig tray-loader cds). Once you pull the logic board/cd assembly you
can easily see the battery near the ram slot and replace it.
NickUtah
>From: Joan Keenan <[EMAIL PROTECTED]>
>We have about a dozen iMac 233 revision B in a school computer lab. They
>are all on apc line conditioners. In the last two months we have had
>three of them with similar symptoms. They start going black and then
>coming back on...will cycle like this for a while after restarting. They
>may be ok for a day or so and then they start again. Finally they refuse
>to start up. Is there any way of identifying if this is a monitor
>problem, power supply or logic board??? Is this a known issue with these
>models? Can we look forward to them all dropping dead on us???
>
>Joan Keenan
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