Why can't I get my screen back when it goes to sleep?

I Have my 17" Macbook Pro (mid-2011) set to have the screen and backlit keyboard turn off after 15 minutes of inactivity, however at least half the time when I come back to use it again and I hit the trackpad or a random key to "wake it up", the backlit keyboard will light up again, but the screen won't come back on...it just stays black and I cant do anything. I have to hold the power button (HATE doing that too) and turn it back on that way....is there a fix for this at all?

I have been having the same problem with my MacBook Pro -2010 though. It just started a few weeks ago; can't seem to get the to screen stay on long enough to log back in; it goes back to black within seconds. I have tried all the different buttons; esc works sometimes after holding the power button down for a few seconds. Eventually the log in screen [or the screen I was at when I closed the top] will come back on.
I hope I can find the answer to this as I can't afford a new machine right now. Besides, it's only a year old but out of warranty.

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Why can't I get my screen back when it goes to sleep?

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