My hp compaq 6720s trackpad stops working almost, after lots of tapping it just moves a little and then again stops. And this happened when I browse the internet with 2 chrome windows and each window have at most 7 tabs open. And when I put mouse with my laptop it shows nothing trouble, works very well. But trackpad looks like that now it stops working. I have 3GB RAM, core 2 duo centrino 2.10 GHz processor with 3MB L2 cache.