My Xbox 360 has popped its clogs. There is sound but not picture. I was playing it last night when all of a sudden the graphics went to what appeared to be 256 colours.

Went back to the dash and it was the same. I switched it off and on and now there is only sound no picture.

The console was banned. Though when I bought it in March this year the sales person at Zavvi told me that if it failed then I would just bring it in and they would swap it over.

Has anyone has sucess returning a console to a shop for a swap over. Do they actually check that the warranty sticker is intact.