Can't wake up my iMac in the morning and fans going full blast

Several times in the morning, after leaving my iMac on all night, I've found the machine asleep and the fans going full blast !?!
This in a cool 68 degrees room.
I then had to turn the iMac off manually and restart. I had a failed power supply replaced in April and am covered under the Apple care program (thank goodness !!!).
Could this be the logic board overheating now ?
Thanks for your help- Jim Vaughn

Hello Jm - it could well be another thermal problem, take a look at your Console logs and see if anything jumps out at you.
Since you do have Apple care (wise man) I suggest you call them and have them deal with the problem.

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This is really worrying because I could have left it in my bag for a lot longer and who knows, maybe it would have caught fire!

It happened again. I did a hard shutdown to keep it from really geting hot. After the boot, I checked the system.log. At the time which I suspect the interrupted sleep occured I saw this, which seemed to repeat a few times:
May 24 15:51:49 DragonStalker kernel[0]: System SafeSleep
May 24 15:51:49 DragonStalker kernel[0]: hibernatepage_listsetall start
May 24 15:51:49 DragonStalker kernel[0]: hibernatepage_listsetall time: 157 ms
May 24 15:51:49 DragonStalker kernel[0]: pages 317726, wire 41405, act 17645, inact 56798, zf 23232, could discard act 40087 inact 138559
May 24 15:51:49 DragonStalker kernel[0]: hibernatepage_listsetall found pageCount 317726
May 24 15:51:49 DragonStalker kernel[0]: IOHibernatePollerOpen, mlget_interruptsenabled 0
May 24 15:51:49 DragonStalker kernel[0]: IOHibernatePollerOpen(0)
May 24 15:51:49 DragonStalker kernel[0]: writing 317506 pages
May 24 15:51:49 DragonStalker kernel[0]: image1Size 62995968
May 24 15:51:49 DragonStalker kernel[0]: all time: 7180 ms, comp time: 1223 ms, deco time: 0 ms,
May 24 15:51:49 DragonStalker kernel[0]: image 251436544, uncompressed 568770560 (138860), compressed 250429744 (44%), sum1 b7819032, sum2 3170f161
May 24 15:51:49 DragonStalker kernel[0]: hibernatewriteimage done(0)
May 24 15:51:49 DragonStalker kernel[0]: sleep
May 24 15:51:49 DragonStalker kernel[0]: Enabling XMM register save/restore and SSE/SSE2 opcodes
May 24 15:51:49 DragonStalker kernel[0]: Started CPU 01
May 24 15:51:49 DragonStalker kernel[0]: IOBluetoothHCIController::restartShutdownWL this is a wake from sleep
May 24 15:51:49 DragonStalker kernel[0]: System Wake
May 24 15:51:52 DragonStalker kernel[0]: hibernate image path: /var/vm/sleepimage
May 24 15:51:52 DragonStalker kernel[0]: sizeof(IOHibernateImageHeader) == 512
May 24 15:51:52 DragonStalker kernel[0]: Opened file /var/vm/sleepimage, size 2147483648, partition base 0xc805000, maxio 400000
May 24 15:51:52 DragonStalker kernel[0]: hibernate image major 14, minor 2, blocksize 512, pollers 3
May 24 15:51:52 DragonStalker kernel[0]: hibernateallocpages flags 00000000, gobbling 0 pages
May 24 15:52:53 DragonStalker kernel[0]: System SafeSleep
May 24 15:52:53 DragonStalker kernel[0]: hibernatepage_listsetall start
May 24 15:52:53 DragonStalker kernel[0]: hibernatepage_listsetall time: 213 ms
May 24 15:52:53 DragonStalker kernel[0]: pages 318013, wire 41442, act 17793, inact 56833, zf 23297, could discard act 40087 inact 138561
May 24 15:52:53 DragonStalker kernel[0]: hibernatepage_listsetall found pageCount 318013
May 24 15:52:53 DragonStalker kernel[0]: IOHibernatePollerOpen, mlget_interruptsenabled 0
May 24 15:52:53 DragonStalker kernel[0]: IOHibernatePollerOpen(0)
May 24 15:52:53 DragonStalker kernel[0]: writing 317779 pages
May 24 15:52:53 DragonStalker kernel[0]: image1Size 63012864
May 24 15:52:53 DragonStalker kernel[0]: all time: 6870 ms, comp time: 1770 ms, deco time: 0 ms,
May 24 15:52:53 DragonStalker kernel[0]: image 251865600, uncompressed 569880576 (139131), compressed 250799380 (44%), sum1 d4c3f6a7, sum2 7a9619a0
May 24 15:52:53 DragonStalker kernel[0]: hibernatewriteimage done(0)
May 24 15:52:53 DragonStalker kernel[0]: sleep
May 24 15:52:53 DragonStalker kernel[0]: Enabling XMM register save/restore and SSE/SSE2 opcodes
May 24 15:52:53 DragonStalker kernel[0]: Started CPU 01
May 24 15:52:53 DragonStalker kernel[0]: IOBluetoothHCIController::restartShutdownWL this is a wake from sleep
May 24 15:52:53 DragonStalker kernel[0]: System Wake
There is some indication that Bluetooth is involved (I could be wrong) but I know my Bluetooth is Off (icon is dimmed) and it is set to NOT wake the computer.

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