I-Mac shuts down after sitting for a while, why and how can it be fixed?

i Mac shuts down when left for a time in sleep mode. Am I missing something or is this supposed to happen?
It has never happened while anyone is using the computer but that may just be because it often sits over night without use.
Am using a logitech Wave USB keyboard and mouse because my wife likes it.

OK reset the SMC > 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.
and check all of the power connections.
The iMac's are sensitive to power issues (sag or momentary outage) while in sleep mode. If in the Energy Saver preference "Start up automatically after a power failure" is unchecked (as it should be) then you could/would/should find the iMac off after a power problem.

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Several Apps seem to just mysteriously shut down after using for a while. Same with Safari, I will be using Safari and it shuts down. Face book too. I've reset and shut down my iPad 3 and restart it, but it stills shuts down. What to do?

Several Apps seem to mysteriously shut down after using them for a while. Face Book shuts down , netflix, Safari, and other Apps. They work fine for a short while, or a long while, and then shut down and it brings me to my regular desktop screen. I've tried restarting by completely shutting down the IPad until I see the apple pic and turned it back on, but the shutdowns of apps continue. Anyone else have this issue? It generally started shortly after downloading and installing IOS 7......

Hi jennyoutwest,
Welcome to the Support Communities!
The following articles will provide some troubleshooting steps for your iPhone.
iPhone, iPad, iPod touch: Turning off and on (restarting) and resetting
http://support.apple.com/kb/HT1430
If that does not resolve the issue, refer to page 146 in the iPhone User Guide to Reset All Settings:
iPhone User Guide for iOS 7
manuals.info.apple.com/MANUALS/1000/MA1565/en_US/iphone_user_guide.pdf
The final troubleshooting step would be to restore your device:
iTunes: Restoring iOS software
http://support.apple.com/kb/ht1414
Restoring your device will delete all data and content, including songs, videos, contacts, photos, and calendar information, and will restore all settings to their factory condition. Before restoring:
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Back up your device.
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Mac shuts down after boot. Is it the logic board?

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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
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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:
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set-defaults
reset-all
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http://support.apple.com/kb/TS1812?viewlocale=en_US
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devalias
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My Mac book pro shut down after getting a low battery message, and now or won't start at all. It's plugged in now and nothing, no fan, no chime when I hold down the power button

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Hey Citrinesky,
Thanks for the question. I understand your MacBook Pro is not responding. The following resource may provide a solution:
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My mac shuts down automatically after 10 Min., I must sign in again and the movie or whatever I just watch is still on in the back.
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I read all the comments, but no help. Even if I turn off the Mac or unplug it, it does not help.

No, did not help. I take it to the store. Thanks anyway.
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           ▹ System Preferences... ▹ Security & Privacy
If there's a closed padlock icon in the lower left corner of the
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Click the Advanced button and, in the sheet that opens, uncheck the box
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I-Mac shuts down after sitting for a while, why and how can it be fixed?

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