Strange problem

I got my 360 about a month ago - up until this afternoon I had absolutely no problems. But while I was playing forza, the game games music suddenly froze (more like a broken record) then the screen blanked. No red lights - I'd only been playing for an hour so it was still quite cool - it just blacked out. Then I restarted it, except now it wont get past the circle X logo thing. I stuck it beside an aircon, let it rest for 5 mins, it loaded but right after I started a race - it crashed again. I don't think it could be a heating problem because yesterday I played for 10 hours straight and it was still cool. Brick is cool as well, and removing the HD didn't help. Is there anything I can do or should i just go get it fixed?Strange problem
Well you said that this is just on Forza, have you tried any other games? It may just be that the disk is scratched.Also, do you keep your 360 on the ground on carpeting or like on a shelf? If you keep it on the floor, static electricity from the carpet can sometimes cause problems.