I have an HP dv4000 laptop. I do some light gaming on it, like CoD, Rome total war and empire earth. It used to run all of these fine with no problem but then out of nowhere it started to lag a lot on cod and crash all the time. now I only really play empire earth and rome total war but like 20 minutes into either game my computer starts to get really hot. if I dont stop playing it will just shut off. even sitting idle it feels really hot. I hear the fan running but I don't know what is wrong with it. I used to be able to run those games without it overheating. any ideas? It gets really hot in the upper left hand corner.