IMac 2ghz won't turn on after power loss

I really hope someone can help me. My 07 or 08 2 ghz iMac will not turn on after losing power which includes being unplugged or the power being turned off. This happens whether or not it is shut down properly. Once it will not turn on it must be unplugged and sit for about 12 hours or be plugged into a different outlet. Outlets are all fine. Have reset pram and all that stuff. It is surge protected. Any suggestions? Thanks

I have been having exactly the same problem as Mhuntet11.
My 2010 i3 iMac will not turn on after losing power, which includes being unplugged or the power being turned off.
It has happened to me 4 times now. In each case - nothing will get it started. But on each occasion - about 2 days after the power cut - the iMac will start up again, good as new.
I have also experienced the other thing that Mhuntet11 said:
"when it won't turn on I plug it into a different outlet and if it does turn on I can unplug it and put it back in the original outlet and it works fine"
Yep - once, after 2 days of trying every power point in the house, I finally started up in the kitchen. Not very practical, so I bit the bullet and powered it down again and moved it back to the office. It stared fine.
Does this sound like a fault that should be serviced? Or is there some re-set technique I do not know about.
I have followed the SMC reset procedure and it does nothing

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Try an SMC reset - sometimes works:
SMC Reset
Shut down the computer.
Unplug the computer’s power cord and disconnect peripherals (printers/external hard disks, etc. but not keyboard or mouse).
Press and hold the power button for 5 seconds.
Release the power button.
Attach the computers power cable.
Press the power button to turn on the computer.

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Suddenly, iMac screen turned to black.
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I brought it to apple store on 4/16 and it is still in repair.
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I have been having exactly the same problem as Mhuntet11.
My 2010 i3 iMac will not turn on after losing power, which includes being unplugged or the power being turned off.
It has happened to me 4 times now. In each case - nothing will get it started. But on each occasion - about 2 days after the power cut - the iMac will start up again, good as new.
I have also experienced the other thing that Mhuntet11 said:
"when it won't turn on I plug it into a different outlet and if it does turn on I can unplug it and put it back in the original outlet and it works fine"
Yep - once, after 2 days of trying every power point in the house, I finally started up in the kitchen. Not very practical, so I bit the bullet and powered it down again and moved it back to the office. It stared fine.
Does this sound like a fault that should be serviced? Or is there some re-set technique I do not know about.
I have followed the SMC reset procedure and it does nothing

IMac won't turn on after power cut

When my iMac is unexpectedly turned off, ether at the wall or during a power cut, it won't then come back on immediately. Sometimes it will come back on after an hour, sometimes after a couple of days. Anyone know why this is? There is no logic to it. I've tried all the trouble shooting stuff; the resetting SMC for example. And I've got a surge protector. I've also taken it into an Apple store, a round trip of 3 hours, twice already over the past couple of months. But after doing some diagnostic tests on it they can find nothing wrong. Also, when they go to turn it on, it fires up immediately. I was told that unless they experience the problem themselves they can't do anything. Which means I'm forever taking it in to them, during this problem, on the off chance it may still be a problem when I get there. It's very infuriating. Help!!!

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I have an iMac G5 that I recently passed on to my daughter. For the past few years it has been working fine except for one occasion that I replaced the power supply. At that time it was still covered by warranty and Apple sent me a replacement unit that I installed myself. Lately, the power cord was knocked off while the computer was on and now it will not turn on completely. It starts for about 15 seconds up to the gray Apple logo then the screen goes blank. I monitored the LEDs and all 3 do turn on then the computer shuts down. At first I thought it's the power supply that was affected with the power cord accident, and bought a replacement unit. I have just installed it but still the same problem exist. I am now asking for help from the expert souls out there to save this computer. Thanks.

No more ideas except to try starting from the install disc and see if that works. Resetting the PRAM might jolt it back to life, it's worth a try, but I am not hopeful.
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If it won't turn on then the monitor is dead (power supply?, video circuits?). Not worth repairing.
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Restoring > http://support.apple.com/kb/HT1414
Make sure you have the Current Version of iTunes Installed on your computer
iTunes free download from www.itunes.com/download
3: If Unable to Restore, try using the Steps in this article to force the device into Recovery Mode.
Note on Recovery Mode.
You may need to try this More than Once... Be sure to Follow ALL the Steps...
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Hi John,
Thanks for the additional information. What I would try next is resetting System Management Controller:
Shut down the computer.
Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
Release all the keys and the power button at the same time.
Press the power button to turn on the computer.
Note: The LED on the MagSafe power adapter may change states or temporarily turn off when you reset the SMC.
You can find the full article here:
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/ht3964
If this still doesn't help, it would be time to take it in to be looked at. You can setup an appointment at a Genius Bar by clicking on the following link:
http://www.apple.com/retail/geniusbar/
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http://support.apple.com/kb/ts3474
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Thank you for using Apple Support Communities.
For more information, take a look at:
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http://support.apple.com/kb/ts3281
If the device remains unresponsive or does not turn on (or power on), reset your device.
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If you are using an iPad, ensure that it's connected to the USB Power Adapter supplied with the device.
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If the device doesn't appear in iTunes, try to force the device into recovery mode, and then restore it.
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Here is an article for you that will help you troubleshoot this issue:
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http://support.apple.com/kb/ts2802
Will not turn on, will not turn on unless connected to power, or unexpected power off
Verify that the Sleep/Wake button functions. If it does not function, inspect it for signs of damage. If the button is damaged or is not functioning when pressed, seek service.
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IMac 2ghz won't turn on after power loss

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