I also have a GTX 560 Super clocked. It's in a new build, that's only about 3 weeks old.
The last 2 Sundays, just out of the blue it has done the pink screen and function loss. CTRL ALT DEL doesn't even do anything. Only thing to do is reset or reboot.
Have 1000watt psu, the current drivers from 3 weeks ago, haven't looked to see if any new available since then. Mine has done this while just simply browsing the web.
I have read many solutions from this website, it has helped me solve lots of problems for many computers. I decided to finally join it today. Hope we can figure out whats wrong, this card rocks on all my games with High and Extra high settings, and I don't really want to change it out yet.