What is not working ? My GPU works in an other computer but not in mine, yet my PC still works...

fbl07

Commendable
Jun 26, 2016
3
0
1,510
I have a problem with my PC : my graphics card doesn't work anymore. Problem is, it still works ! :) I'll explain myself. If I put the GPU in my PC, it doesn't work : any screens connected to my GPU stays black , while any screen plugged in the motherboard still work, and my PC boots without a problem (I'm even posting this question from this same PC). This would point me towards saying my GPU is toast. However, if I put the same GPU into another computer (my brother's) it works, as any screen plugged into the GPU now work properly. So that would point me to say that my motherboard is the culprit. But, I thought that if any in my motherboard was broken it wouldn't even boot. Anyone have an idea ? Thanks a lot in advance !!

EDIT : I tried with my brother's PSU, still didn't detect the GPU

also, for those interrested here is the build :

MB : MSI Z77MA-G45
CPU : I7-3770k 3.5ghz (underclocked at 3.3ghz for temp)
GPU : GTX 760 (normally I run 2 on SLI, but even 1 doesn't work, either of the 2)
- EVGA 04G-P4-2768-KR (ACX cooler, stock clock)
CPU Cooler : Noctua NH-L12
RAM : Corsair Vengance 8GB x2
PSU : Corsair HX 1050 (80+ gold)
Various HDD and SSD
 

fbl07

Commendable
Jun 26, 2016
3
0
1,510
For now, my problem seems to come from my motherboard, (I pretty much eliminated the other possible causes IMO), so I decided to buy a new mobo and CPU (I was a bit due to change them anyway, my original picks were not the best I could done), I will update the answer to this post with the results once I receive and install my replacement.