IMac won't start at all (again)

Here I am again. The problem I described in this thread (http://discussions.apple.com/thread.jspa?threadID=2327452&tstart=0) and had hoped to have solved persists.
I was just writing an email when it shut down without any warning. From one second to the next the screen went blank and now it won't start up again.
My guess now is that it's either a broken power supply, or some malfunctioning hardware sensor (for example heat) which prompts the machine to power off.

You don't mention where you are located but I'd recommend calling AppleCare if you are worried about the hardware however I don't think that's what it is. Look in your owners manual and you will find phone number you are covered for 90 days from the date of purchase for free phone support. If you have AppleCare that is covered for 3 years. If you don't have AppleCare please do yourself a favor and get it, it will protect your system for 3 years from the original date of purchase. BTW you can get AppleCare at a discount from Amazon, they are authorized resellers.

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    I changed absolutely nothing, but the next morning it booted up just fine and continued to work the whole day. But in the evening the same problem came again. I tried everything, reset the SMC, but until now nothing happens when I push the power button.
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    Message was edited by: bristleworm

    Reset the SMC again following these instructions > http://support.apple.com/kb/HT3964
    +1. Shut down the computer.+
    +2. Unplug the computer's power cord.+
    +3. Press and hold the power button for 5 seconds.+
    +4. Release the power button.+
    +5. Attach the computers power cable.+
    +6. Press the power button to turn on the computer.+
    Then if and when you get it up and going in addition to disabling the Schedule sleep settings also note: if the *❐ Allow power button to put the computer to sleep* is checked then the first time you push the power button the iMac will sleep instead of shut down.

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    http://support.apple.com/kb/HT2341

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    http://www.apple.com/buy/locator/service/
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    Judging by your name I'm guessing I could've anwered this in Dutch.

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    <Edited By Host>

    I had the exact same issue...  Macbook Pro late 2008 with Core2Duo.  Went to all the steps suggested in the knowledge base, tried to reset the SMC, but to no avail.   Took it to the Macstore in Mexico, the wanted to replace logic board for $800....  Finally, I sent it to a logic board repair service, where they "fixed"  the logic board for $200.  It worked perfectly for 4 months, then happened again   
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    Quote
    J.C posted "Re: G5 iMac won't start! Help needed." on Feb 4, 2008 4:53:20 PM.
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    UNQUOTE
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    Message was edited by: ChrisRR

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  • IMac Won't Start Up/Boot

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    Why reward points?(Quoted from Discussions Terms of Use.)
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  • My iMac won't start normally it will start on safe boot unless I start in verbus mode single user mode or reset the pram but if I start this way it won't sleep

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