Last night while playing Quake 4 on my 360 the screen started to flicker, it did it twice and then the screen went black.  I can hear the console startup but get no display or red ring.
I've just ordered an x-clamp kit of Ebay and hopefully that should fix it otherwise it might be a new 360 for me.  Worst still Saboteur arrived this morning just to rub it in.