More no sleep issues and sleep troubleshooting

My one year old 20" Intel iMac Core 2 duo has just started not scheduled sleeping (will sleep when directed though...you know what I mean)...this really makes me mad because it's so hard to fix. I had this happen on my old G5 iMac and it took a month and two visits to the Mac geniuses to figure out. Anyway here are the things I tried with direction from this board and an Apple CS rep. (still no joy):
-removed all USB and firewire devices except keyboard and mouse
-made sure bluetooth is turned off (i had a bluetooth mouse that used to wake up my old G4 iBook)
-made sure that windows sharing is off as well as printer sharing and personal file sharing (even though OSX is perfectly capable of sleeping with printer sharing and personal file sharing on while other computers are not connected. Not so with Windows file sharing on in my experience)
-internet sharing off
-reset PRAM
-reset SMU
-deleted cache
-repaired disk permissions
-booted from install disk and repaired disk (no repairs were necessary according to disk utility)
-trashed preferences file (ouch, this really ***)
-created new user account to test and still won't sleep
-booted in safe mode (sleep works!!!!! but only in safe mode)
These are the thing's I've tried...if there's anything any one can recommend on top of these please reply. Since this has been such a pervasive problem with non-laptop Macs I'd really love to see a troubleshooting flow chart for these sleep issues. I'd write it myself if I could get some guidance on which procedure to try first and so on...
Dennis (den.thed) seems to be the sleep guru. If you've got time to weigh in I'd appreciate it before I format my HD and start from zero day.
Cheers, -JV

One thing that work for me was the following: I did all the hints possible but nothing worked until I decided to look at the Console logs, something was preventing the system from going to sleep, I looked at the logs and I had a repeating message: "com.apple.nis.ypbind: domainnname not set. aborting...throttling respawn:will start in 10 sec" it means its an active process. In fact there is a thread here that points toward this message. The message went away with the following fix: in Terminal I typed: sudo domainname example.com ,upon entering I noticed that the Console messages stopped immediately. So the next step was to observe if the computer would sleep on its own and YES it did.
So this may not fix your sleep issues if there is another process involved, but I think the symptoms are very similar. I have also read that some caches folders are corrupt (if upgrading from Tiger) and since repairing permissions is a whole 'nother story these may not be purged at all thus causing conflicting processes and misdirected maintenance scripts that run in the background. If anything new I will kee posting. hope it works

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    "Customers don’t expect you to be perfect. They do expect you to fix things when they go wrong." ~ Donald Porter

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    Message Edited by masnider on 12-16-2008 03:42 PM
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