Sleeping mode problem: the hard disk doesn't stop to run.

Hello,
I try to put my iMac (Lion) in the sleeping mode. The screen becomes black but the hard disk doesn't stop. I don't see any live process in the activity monitor. This problem was not there before and I have no idea to correct it.
I you have a good idea for me !!!
Thanks

Then perhaps you have something now running on your system that is causing the computer not to fully sleep. You may want to open Activity Monitor to check what is running and to see if any application or process may be crashing.
You can also try creating a new, temporary user account, then logging into the new account to see if this issue ceases.

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If you don't have one already, make a backup of all your data right away.
While most bugs in 10.9 Mavericks have been taken care of this does not stop your system from corrupting or bringing out already present issues when upgrading. Your system was likely already having problems (even if you did not know about it), an update/upgrade will bring those out.
Once you have a backup, restart your Mac from the recovery partition (restart, hold down the 'Option' key when you hear the chime and select the recovery partition, then hit enter) and open Disk Utility. In Disk Utility, select your 'Macintosh HD' in the left column and click "verify disk" on the right. If issues are found run the 'repair disk' command. Also run the 'repair permissions' command (no need to verify).
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Hi, I have the same firmware version and my phone behaves the same - screen saver kicks in a few seconds after I lock the keypad, and then sleep mode kicks in right away.
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I have an external backup drive which I use for doing daily backups. I have set an iCal alarm daily to remind me to turn the hdd on at the right time.
When Time Machine comes along in a couple weeks, I am going to be leaving this drive on all the time while I'm working on my computer but was wondering if the energy savings mode of putting the hard drive to sleep applies to external USB drives as well? Would be nice to know that when I put my computer to sleep at the end of the day that my external drive also goes to sleep. I'm not sure if this has to be a function of the external box or if OS X can shut off the drive.
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You can test this very easily:
The "Put the hard disk(S) to sleep when possible" default time is 10 minutes of inactivity.
Just leave your Mac alone for 10 minutes: you should hear both drives spinning down. If the external noise was not clear enough, you can then "wake it up" by double-clicking its icon on the desktop:
If it was spun down, you'll have to wait a couple of seconds or so, with the spinning colored beachball, while it is spinning up again.
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Most of the external hard drives should be able to spin down, at least all my LaCie do it with no problem.

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My old, reliable iMac (the old sunflower flat panel) suddenly froze up and when I did a hard break and restarted it, the dreaded folder with a question mark appeared.
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I'm at my wit's end because, being a freelancer, I have a lot of important information on my iMac, which I stupidly haven't backed up for a long time.
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Will I be safe to move my mbp around in my backpack when I travel? Or do I have to shut it down totally? I tried finding the answer but couldn't find a real response.
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> what happens if I close the lid? Does that option get overridden and the hard drive goes to sleep?
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Sleeping mode problem: the hard disk doesn't stop to run.

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