Hibernate + Random Screen Shut-off Problem

I have an HP G70-250US Laptop running the Windows 7 RC.

Here's my problem:

I have my laptop set to sleep after a certain time and then hibernate after a certain time as well (anyone want to remind me how to change it?). After the laptop goes into hibernate and I attempt to resume windows the screen starts with the HP start-up screen and then goes blank. The wifi turns on and everything. And I can even log-in if I type my password (I hear the log-in sound and everything), I just can't see anything on the blank screen. I have to fix the problem by either shutting down the computer or putting it to sleep using function+F5 and wake it up again.

My other problem is that occasionally, while I'm using my laptop, the screen will go blank and then Wifi will shut off, and I cannot do anything. So I must shut it down and restart it up.

Help would be much appreciated, thanks.

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