iMac won't ever go to sleep on its own

[riker1384]

I have a C2D iMac about 3 years old, with 10.6 and all the updates. I have it set to go to sleep after 30 minutes of inactivity. Sometimes at night I will use it to listen to a podcast or watch a TV show. When I do this, it never goes to sleep. It's always still on when I wake up. The display will sleep, but not the computer. I can put the computer to sleep myself through the Apple menu, but it never sleeps due to inactivity.

I'm worried that having the computer on 8 hours a night due to this problem will shorten its lifespan. Does anyone have an idea of what may be causing it? Does it have something to do with webpages being open? I always have Safari open. It's easier to leave pages open than it is to go through dialog boxes and menus to create and delete bookmarks all the time.

 

[Jack06]

I'm pretty new to Mac's to but...

Are you saying that it won't go to sleep while playing the video or music?
I don't think that would be counted as inactivity, have you checked to see if the program you are using to play these podcasts/music have settings to close the program after a certain time?
I'm not sure if you can have the Mac override the program and sleep..

 

[celticpride678]

Check this link:

http://support.apple.com/kb/HT1776

Reset the PRAM and SMC. Repair your disk permissions.