Shoutbox

I assume this happens randomly while the laptop is in use? So it's not caused by the "Power Saving" settings in Windows 7. You should also check if this happens while the laptop is plugged in or plugged out of the power socket.

Does it "wake up" from sleep mode normally?

Are you not accidentally hitting the "Sleep Mode" keyboard combination? (Windows Key, Right Arrow, Right Arrow, S)

From there on, there are numerous causes for this to happen.. From browsing the web, people seem to have had this problem due to something odd such as bad USB keyboard drivers.

You should try and install any available HP and Windows Updates.
If that doesn't help, perhaps a System Restore is in order?

A similar HP laptop model has been to known to have this issue due to the Video Adapter.

If all else fails, I suggest contacting HP themselves - Hopefully you still have warranty on your laptop.


PS.: Here's a questionable solution:
Press Windows Key + R to open the "Run.." window.
Type "cmd" but hold Ctrl and Shift while pressing Enter.
This opens the "Command Line" in Administrator mode.
Enter the following command:
"powercfg -h off" (without the quotes)

This should disable the "Hibernation mode" entirely, though it may not be a desired alternative for you and there's but a small chance it helps, but you may want to give it a try non the less.