Waking up display since up-grading to Mac OS 10.5.2

Since I up-graded my operating system from Leopard Mac OS 10.5.1 to 10.5.2 I cannot wake-up my computer from sleep mode(it runs with a black screen) without having to force quit and restart it. Is anyone else having the same problem and can you please help?

Try resetting your SMC and PRAM.
Resetting the System Management Controller >>
-Bmer
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Waking up display since up-grading to Mac OS 10.5.2

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