It can be the driver - I've seen reports that the ATI drivers on this laptop breaks suspend/hibernate.
There is a dv8000t that has intel/nividia which seems to work fine and there is the 8000z that you have (I believe) with lots of problem reports but not much of a solution reported
Try another driver if you can - install via envy if possible
(Return from) Suspend not working on HP Pavilion Laptop
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