GPU running but not being detected/RAM only works in single channel

thenizuu

Honorable
Aug 18, 2014
2
0
10,510
So recently i upgraded my whole computer apart from my optical drive, GPU and PSU. I plug everything in and get a few problems. First of all, my 3rd RAM slot won't work so i'm now on single channel.
Secondly my GPU which is running, the fans are spinning, but it's not being detected in device manager and also i cant see the option in the BIOS either for it. So i'm currently running on dedicated graphics and its killing me.
I was wondering if you could suggest ways to fix both of these problems. My build is linked below.
http://uk.pcpartpicker.com/list/GntxgL
 
Solution
Re seat the CPU, check none of the cpu socket pins are bent on the mobo, and check that theres no thermal paste or anything on the contact parts of the cpu or socket.