i have an alienware area51m, and after about 18 months is was having periodic random crashes with games, somehting it had never done before.
well, after 18 months i finally decided to examine it to see how air flow was handled, and low and behold there was dust clogging the main intake it used to blow outside air through the heas sinks of the processor and video card.
blew that stuff out and problem solved.
those cooling pads help keep you cool if you literally have the laptop on your lap, but they do little to cool the laptop since all they do is provide cool air to the outside of the laptop chassis, and the heat that is causing the problem is usually trapped inside the laptop itself.
those HP laptops are a real pain to get into compared to my alientward and most dells, so be careful if you decide to open it up. usually finding the air intake and outputs and hitting those with compressed air will do the job, but i have seen HP's with the main cpu heat sink/air dam so clogged, the dust looked like an air filter because it was so compressed together after years of use.