As far as I can tell as you describe it sounds like your card may have died 2 things to check though
(is your 8 pin-to cpu seated all the way, is your 24pin seated) these help supply mobo pci-e power
are the modular psu cables secure in the base
if all else you may be able to warranty your card I just bought my evga card and know it has a 3 year warranty after I registered it