Imac shuts down w/o reason

Recently I face the problem that my iMac shuts down without any reason, just like unplugging the the power. I did check the power, it's ok. Sometimes it happens after some hours, sometimes just after start-up.
Does anybody know about that?

Hello Fred:
Your profile does not indicate what version of iMac you are running. Take a look at this to determine if your system falls into one of the categories:
http://www.apple.com/support/exchange_repair/imac.html
Barry

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G5 iMac Shuts Down for no reason

We have an almost year old G5 iMac 2.6 GHz, 20" display, with 1GB of Apple RAM that is shutting down, turns off, it just goes dead, for no reason. Sometimes it runs for an hour sometimes for only a few minutes. It boots up OK, I have run all the utilities that the OS comes with as well as the TechTools software (booted to the Disk) and can find no reason it keeps shutting down. I have checked the UPS (also less than a year old) as well as the power cord and plugs. I have updated the OS and am officially out of ideas. And, NO the boss did not spring for the AppleCare protection plan for this machine (we have it on the other Macs but not this one) This is a print shop so all are Macs are vital to our daily work. Any help will be greatly welcomed.

You still have the balance of the one year warranty to get it repaired at no cost to you, however, if this is being used for the production of income, I also very highly recommend the purchase of AppleCare.
Not only does AppleCare extend the warranty another two years, during that period it allows full phone support for both hardware and Apple software (of which there is more and more available, not less), and might allow for on-site repairs! These features could end up being more valuable to you than the usual repair and replacement of hardware part of the deal.
How long have you been struggling with this issue? With phone support you'd undoubtedly have had it solved by now, and could be using the iMac full time, 24/7, with no down time.

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Just got my 20" new Imac and it keeps shutting down after using it for a while. Any ideas?

I have 6 new iMacs (intel based) one at home and 5 at my office as well as a macBook pro. So far 2 of the iMacs are shutting down spontaneously and randomly. When it first started happening I took one to an apple service provider they couldn't find anything wrong and proceeded to charge me for nothing. I then called apple care who told me some things to try that both didn't work. I called apple care back and they told me to take it back to a service provider even though I had already done this (and paid). I took to a different provider who spent a lot of time on it and still couldn't find the problem (they at least didn't charge me). Needless to say I am getting extremely fed up. I made a significant investment in these computers and they have already cost me major headaches and unnecessary time. I have a large amount of apple shares which are at least doing well but who knows what will happen if others are having the same problems without resolution that I am. If you have any luck let me know.

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I've done the smc reset, pram reset and hardware and hard drive check and nothing seems to be wrong. I have also done a fresh reinstall. When I boot in safe mode it doesn't shut down on me. I ordered a new power supply. Might that resolve my issue? My only concern about that is like I mentioned it doesn't shut down on me in safe mode. It's so frustrating! Please help if you can. Thanks!!

First, Welcome to the Forums!
Second, you may not be getting any responses because you posted to the wrong forum. This forum is for Intel-based iMacs. There is a separate forum for G5 iMacs here:
http://discussions.apple.com/forum.jspa?forumID=881
I am curious, however. Is it shutting down or shutting off? In other words, does it go through the normal shutdown process or does it just suddenly power down. The former could be due to a corrupt preference file for your "Energy Saver" System Preference since it's there that you can schedule the system to shut down. The later could indicate a bad power supply or UPS or other power-related problem.

IMac shuts down when using Safari 2.0.4

My iMac shuts down when I visit certain websites such as Pogo or video sites. Took it to the Apple store and of course the problem wouldn't replicate there. They kept it to check out the scripts and logs to see if they could find a problem - without success; although they did suggest my house is haunted. Brought it home and it quit again.
We thought perhaps we were getting interference from other wireless devices and unplugged our cordless phone which worked for a day. The computer always turns back on so its more of an annoyance than a real problem, but I'm baffled.
It also happened once when I was downloading from the iTunes store, but is most prevalent with Safari.
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Hi Barry -
Yes I do live near a ghost town (kinda) - Virginia City, NV. And I did tell any unwanted visitors to leave.
Actually, in the last year, they have replaced the Super drive, power supply, inverter and logic board. The only reason I'm not thinking power issues is that it only happens when I'm in Safari or iTunes. I would use Firefox except I've got java issues with that. I can (and do) use the machine for other things all day long without problems. I can use Safari all day long as long as I'm not playing on Pogo or certain video sites. Maybe Pogo is haunted?
It also doesn't happen on my husband's iMac on the other side of the house. Is there something that could cause enough interference to actually make the machine shut down? Oh, the antennae for the satellite TV and internet are on the roof directly above me, if that would have anything to do with it.
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Model number A1311
Not entirely sure what specs are useful to know so I'm just gonna write some of what's on the box it came in:
3.2 GHz Intel i3 processor, 4MBshared level 3 cache
4GB of 1333MHz DDR SDRAM
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Hello there, TheCapGuy.
The following Knowledge Base article is a great resource for steps in troubleshooting spontaneous restarts:
OS X: When your computer spontaneously restarts or displays "Your computer restarted because of a problem."
http://support.apple.com/kb/TS4636
Thanks for reaching out to Apple Support Communities.
Cheers,
Pedro.

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It looks as if my iMac is within the serial no. range of a recall for power supplies. My wife is taking the iMac to an Apple store today, she called Apple earlier this morning and got an appointment, also we have the AppleCare plan and are still covered. I will post again after the Apple Store visit with an update.
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Make a Genius Bar Reservation
http://www.apple.com/retail/geniusbar/
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Imac shuts down when not in use

I purchased my 21.5" imac July 9, 2011 with Snow Leopard. No problems for 1 month. Then about August 12th or so, my imac started to mysteriously "shut down" when not in use. I'll be working on it, then get up to go pour myself a cup of coffee or something...then I come back to my computer that has now shut off. It is NOT asleep...it is OFF. So I turn it back on and it is fine. This has happened a few times now within a week. Anyone else have this problem?
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thanks!

First thing I would try is to reset the SMC, it can help with power related problems. Shut down the Mac and unplug everything including the power. Press and hold down the power button for 10 seconds. Plug in the computer but be careful not to press the power button as you are plugging it in. Wait a few seconds and turn it on. Hopefully it won't happen again. There is always Apple Support. Don't let the problem persist until your free phone tech support has expired (3 months). I would also recommend using the iMac with an UPS, and at the very least, a high quality surge protector.
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Thanks for all the help.
I went back to his house tonight and we figured it out. I reset the SMU and installed the latest drivers, but the problem persisted. It was a little warm in the room, so we turned on a small fan on his desk next to the iMac. The next time we tried to print, we noticed that the speed of the fan dropped for a moment at the same time the iMac shut down. I then looked to where the equipment was plugged in and found one of those battery backup power strips with the printer plugged in to one of the backed up outlets. I moved it to one of the non-backed up outlets and the problem disappeared. I'm thinking that the printer was pulling too much power from the system and the iMac was shutting down due to low voltage. Just proves you have to check everything.
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Welcome to Discussions - if your iMac is new, it's an intel and you can post on their forum, they'll be able to he you better. However, your first thought should be to call Apple, you have 90 days of free telephone help, and a year's warranty. Since what you are describing sounds like a hardware problem, even if you 90 days are up, call Apple (they will provisionally charge your credit card, but will remit the charge if the problem is hardware related). They will take care of the problem.

Imac shuts down w/o reason

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