IMac sleeps even when processing

Hi,
I have a very large DVD library which I have been (very) slowly converting so that I can watch them on my Apple TV. I don't want to get into arguments about whether or not you should rip DVDs etc, but I've been using Ripit and Handbrake to do so. After ripping the DVDs to the computer I use Handbrake to convert them. If I leave the computer processing these video files and walk away, the computer will go to sleep and stop processing. I always thought that if the computer is "working" then it shouldn't sleep? So surely it should only do so AFTER it's finshed converting the files. When I come back to it later and wake it, the conversion is paused. I could always click "never sleep" when converting, and have started doing that. But this seem wrong. Anyone have any ideas?
Thanks

Good thread on this issues at MacRumours (http://forums.macrumors.com/showthread.php?t=1415661). Suggested solution is to install Caffeine from the App Store (http://itunes.apple.com/us/app/caffe...11246225?mt=12).

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IMac sleeps even when disk activity is occurring - Mavericks

Hi,
I have had this problem for awhile, but was hoping a software update would have fixed the problem (but hasn't).
I have an 2011 iMac running Mavericks and I have noticed that the sleep function does not behave as expected.
I often have my iMac copy files between two external drives or perform backups overnight, but have found that my iMac will go to sleep in the middle of the process. I have my Energy Saver settings set so that my iMac goes to sleep after 15 minutes and will try to put the hard drives to sleep where possible, however my iMac should not go to sleep if disk activity is happening.
I find that when I wake up in the morning, my file transfers have been paused and only recommence once the IMac is woken. This is the same with my CarbonCopyClone, the backup is paused but restarts when the iMac wakes.
It used to be that these functions could happen overnight and my iMac would only sleep once they were completed.
My workaround has been to keep my iMac awake using the Caffeine Application, but this is not ideal as Caffeine does not know when the process has finished.
Any help would be appreciated,

Good thread on this issues at MacRumours (http://forums.macrumors.com/showthread.php?t=1415661). Suggested solution is to install Caffeine from the App Store (http://itunes.apple.com/us/app/caffe...11246225?mt=12).

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My imac goes to sleep even when in use

i ran the hardware test and got this message:logic board-error code 2 STH/1/2 CPU T-Diode
what should i do/

This is not only a logic board problem.
I had the same exact problems as you and have even got the same exact message. I ended up having to get the whole motherboard replaced because of one very simple but troubling problem.
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Hello Chen, Welcome to the Discussions!
Try resetting the PMU for your particular model, according to:
http://docs.info.apple.com/article.html?artnum=14449
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Welcome to the Discussions!
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Hello everyone,
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Try checking the 2nd half of this link
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Hello,
If your OfficeJet 4630 is within the standard warranty period, please contact HP technical support to speak to one of our agents who can troubleshoot and diagnose this issue.
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Hewlett-Packard Company
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I work for HP

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I tried going into Activity Monitor and quitting all the running processes, including those for Finder and stuff, most of these system processes starts up again. But even when I have quit everything that I can quit, the computer won't sleep.
I've tried disconnecting the internet, unplugging all my extras and shutting off Time Machine, but still insomnia. I've tried logging into the guest account but still insomnia.
I went to Macintosh HD>Library>Preferences>System Configuration and deleted the com.apple.PowerManagement and the com.apple.AutoWake.plist, rebooting and testing. But still insomnia. I've also deleted the User>Library>Preferences>com.apple.systemuiserver.plist file, and still no succes.
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If you can get the computer to start in Recovery, then access OS X Utilities,
an attempt could be made to Repair Disk using the Disk Utility there...
Several instances of an upgrade leading to issues in Mac OS X was due
to some previous condition in the computer, or problem in the hard drive,
or maybe insufficient or low-quality RAM installed; among others, before
the last OS X upgrade was installed. And then the extra effort of processing
a new OS on top of other bits, can cause the computer to act up or fail.
What was the previous OS X version? How old is the iMac...?
Did you upgrade from Snow Leopard 10.6.8 to Mavericks 10.9.2?
•Apple - OS X Recovery restores your Mac
http://www.apple.com/osx/recovery/
•OS X: About OS X Recovery
http://support.apple.com/kb/ht4718
•OS X: About Recovery Disk Assistant
http://support.apple.com/kb/ht4848
•OS X System Recovery: Explored & Explained - Tuts+ Mac computer skills tutorial
http://computers.tutsplus.com/tutorials/os-x-system-recovery-explored-and-explai ned--mac-60375
There may be a hardware problem behind the issues your computer
presents, and a diagnostic inspection &/or testing may need to be
done at a Genius bar, at an Apple Store; this is cited as a free service
at US and Canada Apple Stores. If you do not have one, you could
enlist the aid of an independent authorized Apple service company
who has trained technicians on staff; these are often also resellers.
Good luck & happy computing!

IMac sleeps even when processing

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