xbox 360 freeze! wont let me play games

ok so heres the thing, my 360 was working fine until yesterday when guitar hero frooze, i turned it off then on, and it keep freezing at several stages with diferent games, like in the opening xbox 360 screen, in the start screen of a game and so on. I tried to play a demo to see if the same happen and nop, i play grid demo without a problem, so im guessing that the problem may be the lens or something! it may be dirty or whatever, can u help me here please? by the way this is a new console, new chip, hdmi port, cooler, everything finexbox 360 freeze! wont let me play games
Maybe its just overheated. But i think your xbox is dieing. Prepare to send it back to MS. xbox 360 freeze! wont let me play games
Call Microsoft.

eyeliner