Reset the SMU:
http://support.apple.com/kb/HT1767?view ... cale=en_US
iMac power problem
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- Ice Cream Man
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- Caravan Ray
- bono
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Re: iMac power problem
Done it repeatedly. No good.
- AJOwens
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Re: iMac power problem
I know nothing about Macs, but I love a good mystery.
One page I consulted seemed to think it was very important to unplug the power cord at the unit, not at the wall outlet. They didn't say why.
http://forums.macrumors.com/showthread.php?t=987528
Another suggested that depending on your model, the System Management reset may be triggered by an ambient light sensor when you unplug the unit.
http://www.justanswer.com/mac-computers ... won-t.html
So I gotta ask: Which end of the power cord are you unplugging when you try the fix that doesn't work?
One page I consulted seemed to think it was very important to unplug the power cord at the unit, not at the wall outlet. They didn't say why.
http://forums.macrumors.com/showthread.php?t=987528
Another suggested that depending on your model, the System Management reset may be triggered by an ambient light sensor when you unplug the unit.
http://www.justanswer.com/mac-computers ... won-t.html
So I gotta ask: Which end of the power cord are you unplugging when you try the fix that doesn't work?
- Caravan Ray
- bono
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Re: iMac power problem
I think I have pretty much tried every combination and permutation.AJOwens wrote:I know nothing about Macs, but I love a good mystery.
One page I consulted seemed to think it was very important to unplug the power cord at the unit, not at the wall outlet. They didn't say why.
http://forums.macrumors.com/showthread.php?t=987528
Another suggested that depending on your model, the System Management reset may be triggered by an ambient light sensor when you unplug the unit.
http://www.justanswer.com/mac-computers ... won-t.html
So I gotta ask: Which end of the power cord are you unplugging when you try the fix that doesn't work?
I have been trawling the various mac user forums for months now and found a lot of different variations of cord pulling and button pushing. Tried all of them.
I think there is just something wrong with whatever does the 'reset' thing. I have found in some of those forums comments from people with what sounds like exactly the same problem
- AJOwens
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Re: iMac power problem
OK, here's a wild shot. Inspect the AC receptacle area to see if you can find a light sensor. If so, try cleaning it. God knows what kind of gunk could be stuck there!
- fluffy
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Re: iMac power problem
Because computers are apparently products of voodoo and not science/engineering. There is absolutely no reason that would make any difference whatsoever.AJOwens wrote:I know nothing about Macs, but I love a good mystery.
One page I consulted seemed to think it was very important to unplug the power cord at the unit, not at the wall outlet. They didn't say why.
http://forums.macrumors.com/showthread.php?t=987528
If it's not the PRAM or the SMU, maybe it's the PRAM battery? If you can get the darn thing open try replacing it.
- AJOwens
- Ice Cream Man
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Re: iMac power problem
These days you just never know. I still remember my surprise when I learned that my Windows speaker settings were disabled because the the sound card jack wasn't occupied.