My bro's graphics card started smearing the screen, so he bought a Aorus Geforce GTX1060 6GB GDDDRS from Amazon..
I had to shoe-horn it in (very, very carefully). PCI3 power connected (6+2). Booted. Nowt.
It just hangs on the bios screen in both hmdi and DVI-D modes (at first the DVI-D lead would not go in fully as the "blade connector" had to force it's way through a badly moulded hole).
I suspected the maxiumum length card was pushing down on the mobo's SATA data leads for the SSD boot unit. So I cleared a bit of space by rerouting some fat cables to under the mobo.
Still nowt. And the PC self-reboots if turned off.
I refitted the old card, and all works apart from the smearing.
He has a Corsair 750w PSU that should handle it, but with 3 HD's, 2 DVD players, and SSD and a separte sound card, I think it might be hitting it's limits, causing the PSU to reduce a voltage.
But it's spec says "LED power indicators. Be alert when PCI-E voltage is unstable with the smart power LED indicators. When experiencing any power abnormality, the indicator will alert gamers by flashing light."
But those led's don't flash.