MacBook Won't go into deep sleep by itself

I recently noticed that although my monitor will go to sleep after the specified idle time the hard drive never goes to sleep on it's own. The indicator light never goes into "pulse mode". The strange thing is I think it worked fine before I did the recent updates.
I can put it to sleep through apple menu, CMD:OPT:DEL, or by closing the lid. Those methods all work fine but if left unattended it never goes into deep sleep and eventually drains the battery completly.
please help.
Thanks,
Chris
MacBook 13" 2 GHz   Mac OS X (10.4.7)  

It doesn't seem to make a difference if it's plugged in or not. Closing the lid puts it into deep sleep. Unplugging or plugging it in while it's asleep doesn't seem to effect it.

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