So I bought a rx 480 yesterday and it was working perfectly for a couple of hours but then suddenly when I was just doing some simple word processing the whole pc turned off. I've been doing some troubleshooting and I've found out the pc boots if I unplug the 6+2 power cable but if the cable is plugged in all I get is a quick flicker of the LEDs and a twitch of the fans. My power supply is a 80+ evga 500w so I don't think the power supply is the issue. What do you guys think, dead graphics card? Any help would be appreciated.