Just wanted to share my experience of installing this Gfx card yesterday.
I found loads of threads online with problems, but no-one had answers. So I thought it's best have a thread with an answer in case it helps anyone.
I had setup the new machine using onboard graphics and it was fine. installed the new card and whilst it booted okay ( according to fan noise) the Gfx Card did not wakeup/send anything to the screen. Managed to establish the PCIex16 slot was perfectly okay and the screen was quite able to 'auto switch' itself and was fine with both DVI and HDMI...so started to think it was the card itself.
The problem in my instance was solved by reverting to on-board, update the BIOS of the motherboard Gigabyte GA-Z77M-D3H from whatever was packaged to latest online.
That solved it for me. I hope it saves someone else losing two hours of their life!