IMac restarts after shutting down?

Every time when I shut down my iMac it restarts automatically, why is it happening?

Hi, tough to tell, but...
Have you done a PRAM reset, CMD+Option+p+r...
http://support.apple.com/kb/HT1379
In fact, do 3 in a row, takes a bit of time.
Intel-based Macs: Resetting the System Management Controller (SMC)...
http://support.apple.com/kb/HT3964
Still no diff...
One way to test is to Safe Boot from the HD, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, Test for problem in Safe Mode...
PS. Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive
Reboot, test again.
If it only does it in Regular Boot, then it could be some hardware problem like Video card, (Quartz is turned off in Safe Mode), or Airport, or some USB or Firewire device, or 3rd party add-on, Check System Preferences>Accounts>Login Items window to see if it or something relevant is listed.
Check the System Preferences>Other Row, for 3rd party Pref Panes.
Also look in these if they exist, some are invisible...
/private/var/run/StartupItems
/Library/StartupItems
/System/Library/StartupItems
/System/Library/LaunchDaemons
/Library/LaunchDaemons

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Satellite Pro P300-05X restarts after shut down

Hi All,
I've owned my notebook (Satellite P300/05X, Processor P8600 (2.4GHz), 17" Display) now for 1 week and I have been very frustrated with this problem I'm about to explain.
After selecting "Shut Down" option (not "sleep", not "hibernate" etc, but definitely "shut down"), the notebook goes through the steps of shutting down, and then all the lights on the touch finger pads turn off, and then the light from the main switch turns off. And then for no apparent reason, the notebook starts up again like as if I've pressed the switch back on! This morning was the worst, I went through the steps of shutting down 3 times! before it actually switched off...very frustrating especially if you're in a hurry.
Also, I have noticed occasionally the main switch light does not go off at all, all other lights do however, but not the main switch...and then all of a sudden, the machine springs back to life!
Now this problem is very random and does not happen all the time. On average it will automatically restart on, say 1 out of 7 times (except this morning!!!).
As I've said, this machine is very new. It has Vista Business, and I have installed only a handful of programs (Eclipse/Java, MySQL...that's pretty much it). And I'm very sure it's not a virus, nor malware. Plus I have not changed any BIOS settings.
But I have turned off all power options in the Control Panel (that is, "never" turn off hard disk etc etc).
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Have you connected external devices to the notebook like printer, external HDD and so far?
Disconnect them because this could maybe cause the issue.
Make sure that you have wake up on LAN in BIOS and Windows disabled and you should also disconnect the LAN cable and other cables.
Check this and try also to update the BIOS.

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This problem is not the natural OS problem where an application resists the machine from shutting down and hence the machine restarts...
This is differemt..
I had posted on this community earlier too, but no one seems interested to reply to my post..
Its high time to take some bold steps because its almost 10 months (my laptop is just 11 months old) that i am facing the same problem and no one from this community or even the customer care people are able to solve the problem.
If you are not able to solve the problem please atleast exchange the machine..
THE PROBLEM THAT I AM FACING IS DESCRIBED HEREWITH:
When I shutdown the laptop, the laptop starts automatically after 2-3 sec(it does not restart) after it gets switched off completely(the white led light on power button is off). This scenario is different from the normal restart where the led light is on all the time. Here, the led light goes down(turns off) which means that the laptop is turned off completely, but suddenly after 2-3 sec the laptop starts again..
I am facing this problem from the second month of purchase. I am using DOS system, with 64 bit Win7. I have formatted OS a couple of times.
I was asked to replace the motherboard of the laptop by one of your Customer Service Centre, and I did so, but the problem is not solved. Although i have started facina a new problem of heating. The laptop heats up quickly and the laptop has restarted due to generation of extensive heat couple of times.
The laptop is currently in the Lenovo Customer Care since last 5 days for the above mentioned reasons.
Serial Number of my laptop is **********
I am facing a problem since last 10 months and no one from Lenovo Community seems interested to solve my problem. Neither the customer care is able to solve the issue.
I feel sorry that I trusted Lenovo for their technology and their support..
You can view my earlier post in the following link:
https://forums.lenovo.com/t5/Lenovo-U-and-S-Series-Notebooks/My-Lenovo-S510P-Restarts-every-time-i-S...
I mentioned about the role of RAM in this problem, but even after removing the extra RAM card, the problem still persists.
Mod comment: Serial number removed for members protection.

Hi
You could try unplugging any USB devices, especially the keyboard, to see whether it makes any difference. If you have an Apple Studio or Cinema display, you could also try disabling the display power button via the OS X displays system preference.
I seem to remember people have also reported issues in the past where by they've been able to start up and shut down G4s by switching on a walkie-talkie or similar device.

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Hi
You could try unplugging any USB devices, especially the keyboard, to see whether it makes any difference. If you have an Apple Studio or Cinema display, you could also try disabling the display power button via the OS X displays system preference.
I seem to remember people have also reported issues in the past where by they've been able to start up and shut down G4s by switching on a walkie-talkie or similar device.

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Message was edited by: jram1111

Hi, I had this problem and it was due to setting file vault in the security settings. I removed having that set and then I had to go into system settings, Account and under Login Items, add back items such as mail and things that required passwords that were not coming up on my dock after each time I shut down.
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Hello,
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Welcome to Apple Discussions.
Disconnect all peripherals, (unmount any firewire devices before disconnecting) just your Apple keyboard and mouse and test.
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-mj
[email protected]

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Why can I not restart or shut down my imac without using the power button?

why can I not restart or shut down my imac without using the power button?

Reset the SMC and then try a restart or shutdown from the drop down menus.
Intel-based Macs: Resetting the System Management Controller (SMC)
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A reset may be what is needed.
http://support.apple.com/kb/HT1939
http://support.apple.com/kb/HT1436

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Hello,
My laptop after restart or shutting down doesn't starting.
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Any suggest?
Thanks,
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To be honest I dont know if there is the problem actually. Most important thing is that your notebook starts. I dont know if this is so important if this happen after 5 or 10 seconds.
We dont know which notebook model do you have, how old it is, since when you have noticed this strange issue, so it is not easy to understand the problem.
>My laptop after restart or shutting down doesn't starting.
It is not easy to understand this statement. Does it mean that when you click on restart or shutdown option in start menu notebook react properly but cannot restart or be switched on immediately?

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Reset the SMC (System Management Controller), click here, read the notes and follow the directions.

IMac restarts after shutting down?

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