If i recall correctly, this is a known problem with the upgrade to 10.2.2.
Perhaps there is help at
www.MacFixIt.com   and/or
www.MacInTouch.com


Mike Burns wrote:
> List Folks,
> I think my Rev A iMac may be dead.  
> I upgraded from OS 10.1.5 to 10.2.   Then I upgraded
> to 10.2.2.   no problems.       left it on ,, & went to dinner.  
> ...later, it was off.  When I pressed the power switch, nothing happened.  Then
> I unplugged it and several minutes later, plugged it in again.  This time it
> began to start up as normal, including the bong, but after 3 seconds (right
> after the power light changed from orange to green) it shut down.  


> 1. I am 99.99% sure I have the correct version of firmware (1.2) installed.
> Though I didn't check it immediately before installing 10.2, it did check it
> before installing OS X when OS X first came out, and since firmware 1.2 was
> released in 1999, it must have that version installed.
> 1a. It had been having intermittent problems waking from sleep for a couple
> weeks prior to this.  But that had seemed to get better after I rebuilt the
> desktop in 9.2.2 a week or so ago.  (Not exactly sure why that might help
> waking from OS 10.1.5, but I tried it for superstitious reasons, if nothing
> else.  And the wake up problem did go away after that.  Or at least it
> seemed to.)
> 1b. It also had had a problem a few months ago with the screen going black
> for a fraction of a second and then returning to normal.  I cleaned out the
> dust inside and tightened the video connector to the monitor and that seemed
> to fix it.  However, after installing 10.2, I saw that black flicker one
> time in the afternoon.
> 2. It has to be unplugged for several minutes (have not timed exactly) for
> the above startup symptom to occur.  Otherwise, when I push the power
> button, nothing at all.
> 3. I tried starting from CD (OS 10.2 install CD, Tech Tools Pro, and Disk
> Warrior all result in no change to above symptom).
> 4. I swapped the hard drive.  Again no change.
> 5. I took the battery out, let it sit for 30 minutes, and put the battery in
> again.  No change.
> 6. I tried a CUDA reset.  No change.
>  
> Thanks  
> Mike
> 
> 



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