Please help me!! I have tried everything I know to resolve this problem, but i cannot get my iMac (intel) to automatically sleep!! I have reset PRAM, unplugged all USB etc, tried deleting some pref files but all to no avail. There are a few threads already on this but none have come up with a trouble-shooting guide. Are there any steps I could follow? Is there a way to 'see' the sleep timer so I can see what i resetting it? Are there any known programs that can cause this? I noticed on some programs there was a check-box enabling 'Do Not Sleep' when active. I'm wondering if one of these (now redundant) programs have left the computer in a 'do not sleep' state?(!) Any help would be much appreciated. Thank you.