IMac 2010 27" shuts down after boot

iMac was running fine and then I went to it and thought it went to sleep, but it was actually off.
Odd.
I reboot, it boots up (Lion) and everything is fine, and then a few minutes later, it shuts off. Try to boot agian, get the chime, and it shuts off.
Now, whenever I boot it gets to the desktop and shuts off, if I try again right after it will hit the chime and shut off. The longer I leave it unplugged, the longer that it stays alive.
Very odd.
Anyone ever seen something like this? I have put in a new power supply, taken out and put in different RAM (as well as single sticks, one at a time), I have even switched logic boards (that was daunting). Since I have no warranty, I have nothing to lose...but it seems like a heat issue if you ask me, since the longer it is unplugged, the longer it runs (never going over 5-6 minutes).
I have pulled out the i5 CPU and reapplied the thermal paste, so I don't think it's that either.
All of the connections inside seem fine, the only thing out of the back is the USB keyboard. I have done the PRAM and SMC resets.
Thoughts?

Have you tried booting into the Recovery HD, selecting Disk Utility>Macintosh HD>Repair Disk to see if any repairs are needed.? If anything gets fixed/altered click on repair disk again until you get a clean pass. Restart as normal from the Apple menu. To do this, restart holding down Command + r (more details here: http://support.apple.com/kb/HT4718 ).

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Mac shuts down after boot. Is it the logic board?

mac shuts down after boot. Doesn't go beyond gray screen with apple. Is it the logic board?
I do not have the start up disks to safe boot or check the hardware.
Any ideas what the problem is or is it junk? It is 8 years old.

Shutdown your machine. Hold down the shift key. Poweron. Wait awhile Wait awhile while you harddrive
is being checked.
http://support.apple.com/kb/ht1455
I'd let the machine sit for awhile in open firmware & see if it stays alive. Do a few prints.
Sometimes if volumes don't appear in Startup Manager (what you get when you hold down the Option key at startup), you need to reset the Mac's PRAM, NVRAM, and Open Firmware. Shut down the Mac, then power it up, and before the screen lights up, quickly hold down the Command, Option, P, and R keys, until the Mac has chimed twice more after the powerup chime. Then, before the screen lights up, hold down Command-Option-O-F until the Open Firmware screen appears. Then enter these lines, pressing Return after each one:
reset-nvram
set-defaults
reset-all
"The reset-all command should restart your Mac. If so, you have successfully reset the Open Firmware settings."
http://support.apple.com/kb/TS1812?viewlocale=en_US
How to eject a cd from the internal cd drive:
eject cd
List of devices:
devalias
Restore Tiger 10.4 & Leopard 10.5 DVDs are available from Apple by calling 800-767-2775 as of January 20, 2013.
https://discussions.apple.com/thread/4720126?tstart=0

IMac starting and shuts down after less than one minute...

Hi !
I hope someone could help me with this problem...
I think I've tried everything... CMD+Alt+P+R / CMD+R / ... SMC...
I'm a little lost because I can't access to the computer (it shuts down before arriving on the desktop). I've also tried to access just to the hard drive by connecting 2 Mac with Firewire cable... And the same problem appears. The iMac is also shutting down to soon to backup anything...
Is there someone who has experienced the same problem ?
Thanks !
Best regards,
Jonathan.

Hi Jonathan..
Just to rule out any hardware issues, might be a good time to run the OS X Lion: Use Apple Hardware Test

After installing Maverick on my iMac, the computer shuts down during boot up. Suggestion?

I installed on an iMac purchased new in January 2013 with full specs, the computer shuts down every time the desktop begins to load. I've reinstalled Maverick twice from Restore screen, all to no avail. I don't have any recent Time machine back ups to restore from because of external hard drive failure. Have a few thousand dollars worth of software on the computer that won't be replaced if not deactivated, so would hate to lose it all, but most of my data is in Drop box. Any suggestions?

Have you tried booting into the Recovery HD, selecting Disk Utility>Macintosh HD>Repair Disk to see if any repairs are needed.? If anything gets fixed/altered click on repair disk again until you get a clean pass. Restart as normal from the Apple menu. To do this, restart holding down Command + r (more details here: http://support.apple.com/kb/HT4718 ).

IMac 2010 randomly shutting down, only reboots when power cable is unplugged and replugged

Specs
It's a stock 21.5inch iMac mid-2010, with the addition of some extra RAM - two more 4gb sticks bringing it up to a total 12gb - that I've had installed for roughly 6 months with no problems.
No problems with my Mac since we bought it from the Apple Store until the last couple of days when this started happening. I don't have AppleCare and obviously I'm out of warranty.
Problem
Seemingly random shut downs. I've tried to work out if it's to do with overheating, but I've been playing some graphically intensive games today and that hasn't killed it. The strangest thing is that most of the shut downs are when it's not even in use - the next time I sit down to use it it has been turned off.
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Nothing happens when I press the power button until I unplug the power cable, wait a few seconds, plug it back in again then press the power button. This makes me wonder if it's a problem with the power cable? Any tests I could run?
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After further testing, it seems to only be powering back on if I leave it unplugged for about 20 seconds. Is this something to do with resetting the SMC?

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How is everyone doing? I hope okay with their macs!
Well, if I boot from my MacBook Pro Install discs, the computer boots off of the discs.
But if I try booting off any media that I burned, the computer shuts down automatically.
What I do:
Put in the disc (I tried both DiskWarrior and Drive Genius 2),
hold down the C key,
the apple logo displays,
the discs starts to spin louder (like if it were to start reading it),
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I thought that maybe it had to do with me adding a firmware password as requested by Orbicule's Undercover... so I removed the firmware password and I still got the same results.
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Lenovo3000 N100 shuts down after boot

I have Lenovo300 N100. Have been using it for 6 years. Now it has a problem. It shuts down automatically after boot. It stays on for about a minute or two and then powers off automatically. One strange thing is, If I start it after a long delay (4-5 days) it boots and stays on for a longer time (15-20 min) before auto power off. But more I use it, quicker it powers off. Any help. Avinash

Hi Avidesh
Welcome to the community
Since your system is powering on after few minutes after it is powered on . It seems to me that the Heat Sink Fan might have accumulated some dust and it is not able to properly cool down the system , that is the reason the system is powering Off after so me time . I would recommend to have the heatsink fan cleaned properly
You may Please refer to HMM user manual how to open the heatsink fan and then can clean same .
http://support.lenovo.com/en_US/research/hints-or-tips/detail.page?LegacyDocID=MIGR-63486
If you are not comfortable doing the servicing of your own , please visit the nearest service center for assistance
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Okay I just bought a new motherboard and CPU and I'll boot up the computer and 10 seconds later it will shut down. The network card's green light will still be on but the computer won't boot up when I press the power button. I have to unplug the power cord and plug it back in before it will turn back on.
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MS-6570 ATX Mainboard K7N2 Delta Series
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IMac won't shut down after using Time Machine

Here is the thing: My iMac (late 2009, 24", 8 GB RAM) won't shut down when I use my external HD for Time Machine. After the back up I try to eject the external HD but the icon won't disappear on the screen, it only gets blank and is not clickable anymore. It is still visible in the menu of the Finder but with no ejection sign anymore. Programs that were open before won't close even if I use the forced shut down function. But it seems like they are closed as they don't appear on the list anymore. When I then try to shut down the whole system the screen goes black and the wheel turns for hours! So that I finally have to shut it down manually.
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Okay, just realized that the same problem occurs with the MBP after rejecting the external HD
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Either:
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or
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Hey Guys
I´ve got a problem with my mac...27" intel i5 (sep. 2011) with snow leo.
When i listen music to itunes and whant to shut down the mac it only comes a blue screen und then nothing....
it doesnt shut down and i tried it 1000 times...
When i don´t use itunes everything worked very well.
I checkt my mac with some tool, claen it, installed itunes again, but the problem ist alsway there
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sorry for my english i come from germany

Hi pooloo2094,
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MacBook Pro shuts down after booting

My MacBook Pro doesn't boot. It simply restart after the Apple logo and a few seconds of pinwheel.
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Hi B,
You can't even startup in Single User?
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If Single User is possible get the syslog report posted here.
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Mac Pro Shuts Down After Boot.

Hey guys I have a 2008 Mac Pro. I went to turn it on today and It started like normal up to the Apple logo screen then shuts off. I've looked around on here for a while and cannot find any posts that have the same problem that I am having. Any ideas????

Have you done any maintance on your mac pro lately?
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Try to check your internals of the mac if its clean, disassemble the heatsinks, both on northbridge, CPU and, GPU. Also remove the PSU cage to look for dust at/inside the PSU, if so disassemble the PSU and get it clean. Don't just stick a vacuum cleaner at the back.
check this guide how to disassemble the CPU heatsinks
http://www.youtube.com/watch?v=xOF435jCg8E
If it don't help, call apple support or go to your nearest Apple store for repair service.

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Hi there
My retina macbook keeps shutting down after booting and rebooting by its own a minute later. No error message is displayed or anything like it, it just magically shuts down.
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I have tried to reset the PRAM without success.
The only time the issue doesn't happen is when I do a Safe Boot.
Can anybody tell me what is up with my Macbook (I really need it for work AND school).
Thanks

Have you done a SMC reset?
http://support.apple.com/en-us/HT201295
Run an Apple Hardware Test:
http://support.apple.com/en-us/HT201257
Download and post an EtreCheck report:
http://www.etresoft.com/etrecheck
Ciao.

IMac shut downs after Apple logo appears!

Since I installed Maverick my iMac been acting weird. Now when I turn it on it shuts down after the Apple logo appears!
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Try these in order testing your system after each to see if it's back to normal:
1. a. Resetting your Mac's PRAM and NVRAM
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     Reinstall the 10.9.2 update: OS X Mavericks 10.9.2 Update (Combo).
4. Reinstall Lion/Mountain Lion, Mavericks: Reboot from the Recovery HD. Select Reinstall Lion/Mountain Lion, Mavericks from the Utilities menu, and click on the Continue button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.
Reinstall the 10.9.2 update: OS X Mavericks 10.9.2 Update (Combo).

IMac 2010 27" shuts down after boot

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