Brand new pc: display and motherboard problems

Myself22

Commendable
May 16, 2016
1
0
1,510
I built my computer 4 days ago and it worked for 2 days, then my moniter stopped detecting any video input. All my cords and connections are fine I think. Here is a part list.

Apevia x dreamer 4 case
Cosair cx500m psu
Amd fx 6300 cpu
XFX r7 370 graphics card
Gigabyte 970a ud3p motherboard
Asus vx238 moniter

Another thing is that the 8 pin connector coming out of the power supply is keping the video card from working. The only way the video card works is if the 8 pin cord is unplugged. This is my first pc build and I'm not quite sure of how to do everything yet.

Any help is appreciated!