Are you hearing your fans kick in? I'm noticing on our 906US that the fans aren't coming on- this laptop used to always run the fan. What are your power options set as? This happening while your using it or while it's going into screensaver, etc?
Compaq has a web chat that is free even if your warrenty has expired.
From Compaq- patches for XP
- you don't say what OS it's running. Here's the page
to select other OS's. I wonder if a driver update will cure this problem. Looking at your specs, I'm unsure if your even running XP.
I'm seeing HP Notebook PCs - Display is Distorted or Checkered
when Pressure is Applied to Base- I wonder if there is a recall on it?