OK, this is a weird one. I've already gone through EVGA replacement on the GeForce GT 710 card, so I'm pretty sure that its not the issue.
I have an HP Pavilion desktop 590-p0066 and I'm using a Pavilion 32" display along with an Acer 22". The 32" (primary display, #1) is connected using an HDMI to DVI cable and the Acer (secondary, #2) uses a DVI-DVI cable. This configuration worked fine until it suddenly didn't, so I exchanged the card under warranty.
Since then I've replaced every cable including power cords just to be sure with no luck. I have also swapped out BOTH displays.
Now I have discovered that if I unplug the power cord from the Acer, it suddenly appear in the Display Setting control panel, but there's no image displayed if I plug it back in.
The only thing I haven't tried yet is getting a mini-HDMI cable to use that port instead of one of the DVIs on the card.
Any ideas???