Sleep all of a sudden stopped working

All of a sudden my IMAC will not go into sleep mode. The only way I can get it to work is if I do it manually. I have looked up everywhere regarding why sleep mode is not working on Imac and I just can't seem to find any answers. The only three programs that I have running are.. Safari and Finder. Any help would be greatly appreciated.
Thank you
Also I have all the latest updates installed.
Message was edited by: mark_chestnut

If it's still covered under warranty, whay worry about fixing it yourself? Take it in and get it replaced. Unless, of course, you dropped it and there is evidence to that effect, which would explain the stuck button.

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