My iMac will no longer go to sleep on its own!

Help!
My iMac will no longer go to sleep on its own! No matter what my settings are under 'Energy Saver', the computer will NOT go to sleep. Rather, the monitor will just turn off and the white light on the front of the computer will come on. The white light does not 'throb', so I know it isn't sleeping.
I'm not running any weird applications preventing it from sleeping, I've tried booting in safe mode, and I've tried resetting the SMC.
This is a RECENT problem - I think it started occurring after installing the 1.0.1 firmware OR Mac OS 10.4.6 update. Does anyone else have this problem??
AHH! Thanks for your help!
Jonathan

Hey everyone -
Thanks for your suggestions.
David.Austin - yes, my power LED does not fluctuate, so I know the computer isn't sleeping, the display is just 'off'. I do have all my disks set to go to sleep. This is a recent problem - everything used to work just fine.
joejoe - I haven't yet tried zapping the PRAM (or NVRAM), but I give that a shot and reset the SMC (SMU) again. If that doesn't work I'm going to have to do a... re-install.
I'll report back with my results. Glad to hear I'm not the only one with this problem.
Agreed - there is something wrong with one of those two updates.
Jonathan

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X423424X wrote:
Yes. But (a) sometimes you never can, (b) it may be caused by something you need or refuse to part with, and (c) it's just not worth the effort if there is an simple alternative solution.
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