check your PSU & cables maybe either of these quick simple fixs first. Try the simple things go around & do the simple steps before doing anything. Got a spare HDMI cable & PSU try them first & eliminate any problems like that first before thinking your cards died. Had a PSU die a while ago by Videocard getting a bit of power thinking the mobo died threw in a working PSU & fired up first pop so try these ideas first. Been here done that.
