IMac will not sleep!

I have no idea why it's doing this. I just completed a fairly recent reformat and reinstall (two months ago). The iMac will not go to sleep by itself. I have it set to 30 mins and nothing. The screen shuts off when it's supposed to , but that's it.
I have two admin accounts and both are set the same in the energy settings. It does this even if no apps are running. It used to go to sleep just fine.
Any troubleshooting I can do?
Intel Core Duo iMac
1GB Ram
Using Airport

I am using my 17" intel iMac as a base station to send internet connection to iBook in another room. My iMac is connected to ADSL modem by ethernet. I have to manually put the machine to sleep; when the timed settings for sleep are reached, the screen will go black, but it is not sleeping; it is still transmitting the internet connection with the airport function. When I manually put it to sleep by clicking on the Apple icon, it stops transmitting the internet connection and actually goes to sleep.

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I have read I can shut down "processes" but I'm afraid to as I don't know which ones to shut down and I don't want to mess up the system.
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Thanks
Message was edited by: Paul131313

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