Why won't automatic sleep work on a Macbook?

My macbook goes to sleep fine when I close the lid. I have no issues putting it to sleep using the menu command, but it will not go to sleep on automatically. I had this problem in 10.4 and it has continued under 10.5. I did a clean install a week ago, carefully making sure after every application that automatic sleep would work. It did, though it usually took 1.5x as long as specified in the energy saver.
The only non apple apps I have are: Office 2004, STATA, Gimp, Handbrake, and Poker Academy 2.5.
So, last weekend having made sure everything was working, I moved my files back on to the computer. The only preferences I retained were those in the iPhoto and iTunes folders, my Safari bookmarks, and my address book and iCal files.
Now, one week later my Macbook will not go to sleep. The same thing happened after I started using this summer, only I didn't go to the trouble of testing sleep as I installed apps. I just noticed one day that if I left the lid open it would never go to sleep, regardless what was plugged in, energy saver settings on anything else.
I asked a Genus about this and was told it was a Software issue. I tried very hard not to be mad. This is my fifth apple laptop (two from work) and none of the others have had this problem.
Anyone else having this problem?

It most likely is a software issue ...to confirm this try booting into 'Safe Mode' and seeing if things resolve themselves. If they do, then it may be certain 3rd party software that is preventing sleep.
If not, then it may be a hardware issue - in which case you'll have to bring your book in to an Apple Tech.
http://docs.info.apple.com/article.html?artnum=107392

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