This is what i get randomly, while on the desktop, not in gaming, not sure if this is the monitor or gpu, i have warranty on the card, i can rma it, but i want to be sure.
That pink screen is a known driver issue, happened to me couple of times (i have a 460gtx) while i was browsing, never in games. Drivers older than 296.10 do not have that bug tho. You can try googling for "nvidia pink screen" or something.