The photo isn't particularly clear but I'd make sure to double check the connection to your graphics card as well as the 8pin connector in the top left of your motherboard. The PSU you have provides a pair of "6+2" PCI-E power connectors, this means you have a 6 pin connector and then another 2 pins hanging off of that. As your video card requires an 8pin connector you should take one of those connectors, put the other 2 pins onto the side of the 6pin one and connect it to the card to ensure all 8 connectors are filled. Your PSU should then have a 8pin CPU power connector which should be able to be separated into a pair of 4pin connectors, you need to connect the full 8 pins of this to the CPU power connector in the top left of the board.
When doing this, make absolutely sure that you don't end up connecting a "6+2" PCI-E connector to the motherboard or the 8pin CPU power to the video card, the connectors are slightly different but can sometimes fit if you force them, they aren't wired the same so connecting them the wrong way around risks damaging your board and/or video card.
If this still fails, it would be ideal if you could upload several high resolution photos of the connectors in the top left of the board and on the video card. It's also worth checking the connector from the power switch is on the correct pins as this is quite easy to get wrong.