I have that happening sometimes to my Powerbook G3 Series. It will go to sleep normally, but when I wake it up it will appear to be waking up, but the screen will stay black and no sound. The machine IS awake though, because I can hit the power key and return and it will turn off gracefully, then I can turn it back on and all will be well. On that machine it happens about 75% of the time, and it never happens to my new iMac, or my blue "toilet seat" iBook.
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