Problem with my x51 :(

I recently have been getting a problem with my (around three month old) Alienware x51. When I am on it for a little while, all of the lights, on the sides and on the front (3 in total) turn red. it does feel slightly warm around the back and I am unsure whether it is just due to overheating because of dust blocking the vents. i then carry on playing my game, expecting the inevitable and then my monitor says no signal but the computer is still on with the red lights. I apologize if there is already a thread for this but i have searched and couldn't find one.

Another piece of possibly useful information would be that it only started happening when I began playing APB reloaded a while back.

Thanks in advance for any of your help :)                                                                                                                                                  EDIT: i just launched ABP and the lights turned white, don't know if that is helpful or anything.