I recently bought a new evga 660 ti graphics card, it installed fine and was running smooth for a few days. Then one morning it wouldn't boot up past the first motherboard splash screen. I re installed the my older card (PNY GTX 550 TI) and everything works fine. Haven't been able to try installing it to another PC.
Something very well could be going on with the card. Where you can RMA the card with EVGA I would if I were you take it back to the store and exchange it with them or RMA it with them and get a replacement or your money back to buy a different card and try it again. Right now is the prime time to get things exchanged with little to no fuss past 15-30 days and it goes to mailing out a card to EVGA for a week and then maybe a week to get back.