IMac goes into sleep mode although hard disk is active

Hello,
my Mac has a large task to do - it should rebuild a corrupted iPhoto library which takes a long time.
So I though I leave my iMac running in the night and after it's finished it will activate sleep mode (which is set to 1 hour of inactivity).
However when I leave my Mac it activates sleep mode (after that 1 hour) while the task is still running.
I thought when there's write activity on the hard disk, the sleep mode won't be activated...
What am I thinking wrong or is there a wrong setting?
I'm using iPhoto Library Manager to rebuild the iPhoto database which has no option to sleep after the task is done so here won't be a chance to do that.
Thanks!
Markus

The sleep timeout has nothing to do with disk activity. It's based on user input, although some background processes can pre-empt it. If you don't want the machine to sleep automatically, disable automatic sleep in the Energy Saver preference pane.

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Continuously goes into sleep mode

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my fans run excessivly and the computer will start to go into sleep mode after being on for maybe 30 mins and then just keep doing it right when i start it back up. has anyone else had this problem?!?!?!

I too am having the same problem with my G5 going into sleep mode, although I must be lucky because I get about ah hour out of it before it shuts down. The problem appeared after replacing a logic board with blown capacitors at an approved service center. Since then they have also replaced the power supply and it is in shop now getting it's third logic board?!*@#! I do have to admit though that apple has coverd the cost of all repairs so far in spite of expired warranty.
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If you want to read the whole time line, I've included it here. I apologize for it being so long.
At first I was running Lion (10.7.5) and the computer would enter sleep mode whenever I was doing anything with video. For example, watching YouTube videos and chatting on FaceTime. And funny enough, I distinctly remember watching a bunch of movies with VLC and the computer did not go to sleep (Although, this is not true anymore). I could wake the computer up and use it, however within a few minutes the computer would re-enter sleep mode. The computer seemed fine and I could access all of my files. Tried resetting SMC and it did not resolve the issue.
I made a Genius appointment to see if they were familiar with the issue. The iMac passed the in-store diagnostics test; it said all the components were functioning properly. He told me to bring it home to do a fresh re-install of my OS and then run my computer to see if the problem persisted. I took it home and reformatted my HDD with a 35-pass erase, re-installed Snow Leopard (10.6.8) and declined to transfer any backups from Time Machine. I was using a fresh system and sure enough, the problem persited. Tried doing the same thing again but with Lion (10.7.5) and still no luck. So I made another appointment and it passed the in-store diagnostics test again. I let them keep the computer for a 24-hour diagnostics test. They told me they would diagnose my computer with the OS on my HDD as well as a copy of OS that the Apple store deemed 'good' on an external HDD. The Genius called me and told me that my HDD failed their 24-hour diagnostics test and recommended I replace it. I initially had a 750 GB HDD, and the Apple Store could only offer me a 500 GB HDD ($200). I opted to take my computer to Carbon Computing, an authorized dealer in Toronto, to have a 1 TB Seagate HDD ($170) installed with no OS on it. I brought it home, performed another 35-pass erase and installed Snow Leopard. Problem still persisted. Repeated with Lion, still unsuccessful. Looking back, I was so excited that I just had to replace the HDD to fix the problem, I forgot to ask the guy if he could recreate the issue.
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Now to find out WHY it does it at home only. How hot is it at home? Have you checked the AC current/voltage at home?
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I normally only have speakers set up to my computer and a wired keyboard. The speakers are powered separately. I would assume that at the Apple Store only the power cord and wired keyboard are connected.
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I apologize for the angst. The problem has cost too much money in lost time and material because when it would automatically shut down after a few minutes, all my work was lost.
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Attachments:
PowerHibernateNever.jpg ‏59 KB

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> Was your question answered? Mark it as an Accepted Solution!
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IMac goes into sleep mode although hard disk is active

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