Macbook Pro Display not waking from sleew

Alright so firstly I am aware of the ongoing issues with MacBook Pro's not waking up from sleep period, but that's not what is happening to me.
I've got a 2.5 GHz MacBook Pro, the model that is still currently selling. It always wakes from sleep just fine, except sometimes the display stays sleeping. I know for a fact that the comp wakes from sleep because if I sleep it with say an itunes song running when I open it up again the song will automatically start playing again. However, sometimes the display never wakes up, and just stays dark.
I have absolutely no clue either why sometimes the display wakes up fine and the other times it stays dark no matter what. Once it's dark, putting the comp back to sleep and waking it up again doesn't help either - the only thing I can do it shut it off and restart. Any given time that I wake the thing up, I give it about a 50/50 chance that it will wake up fine or the display will stay dark, and like I said before it seems to be totally random when it happens regardless of when I sleep it or what I am doing when I sleep it.
Anyone have any ideas? Thanks!

I'm not sure then. It could be one of four things: Hardware, firmware, software, or your PMU (Power Management Unit) which is a part of your computer's mother board that does exactly as it's named. It controls the flow of power in your computer and it turns things on and off like your airport card or your hard disks. It also plays a huge part in sleeping. So the PMU is my best bet. You can try resetting it to see if it helps. The article explains it better than I can. In the article they call it the SMC (System Management Controller) but its the same thing.
http://support.apple.com/kb/HT1411?viewlocale=en_US

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Macbook Pro Display not waking from sleew

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