IMac won't turn on after scheduled shut down

Hi, hope someone here can help me!
I have a 20" 2006 iMac. While it was still under warranty, it repeatedly froze, and eventually when I turned it on the screen remained blank although I could hear that the hard drive was at least trying to get started. I got it repaired (new logic board, new screen), but now I am having some of the other difficulties mentioned here, where the screen freezes when using graphic intense software, including 3D games. Sometimes, it works fine for hours, others less than 2 minutes. I used to keep it on all the time, with energy saver set to go to sleep when possible. I've found, though that the graphics problems are less likely to happen if it has been off at least overnight, so I set up the schedule for it to turn itself off in the small hours. The problem is, when I go to turn it back on, it won't come on unless i pull out the power cable from the back of it and put it back in again. Any ideas what's causing this? And any ideas on what I can do to fix it?
Thanks

This just happened to me today. Not sure what to do as yours was the only discussion like this.
Please let me know if you were able to restore it and how?
Extremely frustrated since it was brand spankin new!!

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MacBook Pro 15" won't turn on after a shut down.

My MacBook Pro 15" late 2008 mavericks won't turn on after a shut down. Tried SMC reset, plugged and unplugged charger multiple times as well as installing the battery. It has started that after a while I have replaced my old battery with a new one,upgraded to Mavericks and increased my memory to 4GB. In the beginning after I would install every time the battery ,it' would turn on after 8-10 tries. Today it's completely unresponsive . Tested different outlets, with and without battery,nothing worked. I also heard that some other people have this issue once they have updated their operating system from 10.5.8 to Mavericks. Is that the problem.? Has anyone found a solution to this?

Hi there Olgabinou,
You may find the troubleshooting steps in the article below helpful.
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http://support.apple.com/kb/ts1367
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IMac won't turn on (has been shutting down abruptly in the past)

Okay, hi everyone.
I've got a second hand iMac G3. It had problems with the hard drive earlier, so that's been replaced...
In the past month and a bit my computer has been abruptly turning off (not completely, the white light of the power button is still on when this happens) with no aparant cause. The screen just goes black like turning of a TV screen and I can't do anything but turn it completely off by holding the power button.
After this happens I would try and turn it back on, almost imedeiatly, but it wouldn't turn on: The power button would light up, and blink just slightly, with a slight tick/beep sound to accompany it. This is only straight afterwards though, if I leave it for a while then boot it up, it will be fine.
A lot of the time this has happened when I've just walked away from the computer without it doing anything, other times it happens right in the middle of doing something..
I haven't followed up the problem due to not knowing what it was at first and lack of time, especially this past month since I've been away overseas.
And now it's the last time it's shut down on me. I tried to start it up again straight afterwards, and of course the power light blinked slightly along with the accompaning sound. Turned it off, tried again a bit later, still didn't work. Now when I try to turn it on I press the power button, it lights up for a second then turns off. So my computer wont turn on, and I don't know what to do.
Hope one of you guys know what the problem is.
I was looking at these threads and someone had a similar problem (http://discussions.apple.com/thread.jspa?threadID=1168792&tstart=0), something about the flyback transformer I think, whatever that is. Does anyhone think this could be the problem??
Another thing. Just days ago I was having problems burning cd's (probably still am), something about error code 0x8002006D and not being able to calibrate enough laser power. I don't know if this has anything to do with it...
Thanx for putting up with me, usually it's my dad but he's asleep sick..

No Kittytom is referring to his having found that his iMac wouldn't boot right side up but would upside down. Further circuit disturbance showed that it was bad soldering on the Flyback transformer that was the problem.
Also common were bad soldering on the HV capacitors in the area of the FT. Or just bad capacitors.
If your iMac had cap problems it would exibit that behavior.
Slow breakdown in the insulation of the FT would also act like that.
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My Imac won't turn on. Randomly shut down and randomly shuts off

Yesterday night i was working on my imac and left it on for about an hour leaving the desk. When i came back it was shut down and wasn't able to turn it on. This morning i unplugged it and plugged it to another plug and it turned on. After a while it turned of again and wouldn't turn on. I re-changed plugs here and there with random success. I then changed the the ram as i had put 2x2gb instead of the original 1x1gb si i replaced the original one and it turned on. So to make sure it was the ram i re-inserted the 2gb but it wouldn't turn on and to my great disappointment it wouldn't turn on when i re-inserted the 1gb original ram either... Bit lost. Not sure if it has to do with temperature issues?
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Sounds like either an unseated or bad Ram module.
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This just happened to me today. Not sure what to do as yours was the only discussion like this.
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Imac won't turn on after anti virus software downloaded

The Avast antivirus software was downloaded onto my imac and now my imac won't turn on. What should I do?

Troubleshooting: My computer won't turn on
Read and follow all the steps.
If you find yourself at Step 6 determine if you can start the Mac in "Safe Mode":
Safe Mode or "Safe Boot" is a troubleshooting mode that bypasses all third party system extensions and loads only required system components. Read about it: Starting up in Safe Mode
You must disable FileVault before you can start your Mac in Safe Mode.
Starting your Mac in Safe Mode will take longer than usual, graphics will not render smoothly, audio is disabled on some Macs, and some programs (iTunes for example) may not work at all.
Merely starting your Mac in Safe Mode is not intended to resolve the problem, it's to observe its performance without certain additional components.
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USB external HD does not turn off after system shut down

This is not a new issue in Leopard. I had this issue also in Tiger but I never bothered to ask whether there may be a solution to this issue.
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Detlef Schmitt wrote:
This is not a new issue in Leopard. I had this issue also in Tiger but I never bothered to ask whether there may be a solution to this issue.
I have firewire as well as USB HDs attached to my iMac. If I put my computer to sleep both the firewire and the USB HDs turn themselves off. The HDs come back to live after I reawake the Mac. But if I turn off the iMac then only the firewire HDs turn themselves off. The USB HDs remain turned on.
Is there a setting somewhere that can be changed so that the USB external HDs turn themselves off after system shut down?
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Does the drive turn off when you eject it and then pull out the USB plug? That's important.
Message was edited by: nerowolfe

IMac won't turn on after power cut

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Great advice. And I'll definitely do that - need to get my Mac back on and working before that however.

My iMac won't turn on after power flickered on and off.Is there a virus affecting it or is something ele wrong?

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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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Media key problems like that are sometimes solved by resetting the motherboard.
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Welcome to Apple Support Communities
It's quite possible that the power supply failed. The failure is difficult to be related with OS X Mountain Lion, so I would discard that. In some cases, it's normal that you experience slowness after installing a new OS X version because Spotlight indexes the hard drive.
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Hello,
I'm aware this question was answered elsewhere on this forum but the issue there seemed to be that the imac had been moved and/or jolted. In my case, I went to New York for a week and when I came home the imac just wouldn't turn on. I've bought a new power cable, checked all the connections, disconnected peripherals, tried command/control/power etc. Nothing. I've even tried starting from a Norton utilities disk.
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KH
Imac G3 Mac OS 9.0.x Slot loading CD, Bondi blue

Hi dancebaby,
Thanks for visiting Apple Support Communities.
Start with these troubleshooting steps if your iPhone does not turn on:
iPhone: Hardware troubleshooting
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.
Check if a Liquid Contact Indicator (LCI) is activated or there are signs of corrosion. Learn about LCIs and corrosion.
Connect the iPhone to the iPhone's USB power adapter and let it charge for at least ten minutes.
After at least 30 minutes, if:
The home screen appears: The iPhone should be working. Update to the latest version of iOS if necessary. Continue charging it until it is completely charged and you see this battery icon in the upper-right corner of the screen . Then unplug the phone from power. If it immediately turns off, seek service.
The low-battery image appears, even after the phone has charged for at least 20 minutes: See "iPhone displays the low-battery image and is unresponsive" symptom in this article.
Something other than the Home screen or Low Battery image appears, continue with this article for further troubleshooting steps.
If the iPhone did not turn on, reset it while connected to the iPhone USB power adapter.
If the display turns on, go to step 4.
If the display remains black, go to next step.
Connect the iPhone to a computer and open iTunes. If iTunes recognizes the iPhone and indicates that it is in recovery mode, attempt to restore the iPhone. If the iPhone doesn't appear in iTunes or if you have difficulties in restoring the iPhone, see this article for further assistance.
If restoring the iPhone resolved the issue, go to step 4. If restoring the iPhone did not solve the issue, seek service.
Best,
Jeremy

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If you get no video or audio at all and you have confirmed it's not the power source or power cord then that indicates your power supply may have failed.

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Hello
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IMac won't turn on after scheduled shut down

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