A friend of mine owns a x360 since december, and it was playing just fine till yesterday when appears the dreaded 3 red rings... We opened the box and put a new thermal component inside the gpu and cpu, closed the box and it worked again... for three hours

Now even in a cold state it doesn't work again, I checked the error code....1200, but its not yet explained in the forums

Anyone here heard of this kind of error? pls help