According to this video it's for maximum stability on the GPUs if you have multiple and are overclocking. If you aren't noticing any performance problems or you aren't OCing heavily I wouldn't worry about it.
Checking the card in another PC seems like the best plan. If it works then it might be possible it isn't being seated in your Mpower correctly. Is the little locking clip on the motherboard locking the card into the slot correctly? I've seen a few times where the card is just a tiny bit off and PC won't see it. What happens if you boot up with the HDMI on the mobo and switch to the GPU? Is Windows seeing the GPU in device manager?
I bought this EVGA 1300W power supply new November 25th of last year. It was used for a few months in a build I had running 3 7970s and an 8350. It is like new, ~5 months of moderate (800-900W) usage on the clock. All original stuff included in the retail box.
Looking for $125 Paypal, shipped US48. PM me any questions.
I bought this ASRock Z87E-ITX motherboard July 9th of this year. Originally bought it for a portable build but it is getting parted out and I don't have as use for it now. It only has a handful of hours on it and it was only run with a Pentium G3258 @ 4.3 GHz. Great board with all the original stuff included.
Looking for $90 Paypal, shipped US48. PM me any questions.
Looking to sell this like new Seagate Slim SSHD. It’s the 500GB model with 8GB of built in SSD cache. Came new in my laptop and I switched over to an SSD so I don't need it. S.M.A.R.T. data is clean as you can see in the CrystalDiskInfo picture, it has been zeroed out and it ready to go. Only 10 hours of on time.
Looking for $45 Paypal, shipped. PM me any questions.