Question graphic card being wierd - need help

[carrot__]

My graphic card ports did not work for a year or so. I opened the computer to finally fix it (because I wanted to have a 2nd monitor).

I saw a PCI Express power cable missing and plugged it into the card. Then the graphic card fans started spinning (noisy) and the ports working.
5 min later both fans and ports stopped working as before and I cannot make it work again after trying everything (turning computer off and on, taking the card out and back in, taking the PCI Express power cables out and in).

Buying a new card is an issue because I am poor and this card is quite expensive (Gigabyte GV-R939G1 GAMING-8GD).
Also, there are no updates for the driver and the graphic card has lights on.
Is there any suggestion on how to fix it?

 

[rgd1101]

full system spec? include brand and model of the psu

 

[carrot__]

full system spec? include brand and model of the psu

processor: Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz 3.40 GHz
RAM: 16.0 GB (15.7 GB usable)
System type: 64-bit operating system, x64-based processor

psu: Antec VP650PM 650W

 

[carrot__]

full system spec? include brand and model of the psu

Do you think it might be a power issue? Should I buy a male PCI Express power to male PCI Express power cable and connect the graphic card to the power from the outside cable? I found that even without any male PCI Express power cables connected there are still lights on the card.

 

[rgd1101]

connect the graphic card to the power from the outside cable?

what outside cable?

 

[carrot__]

what outside cable?

8pin male to dual 8pin (6+2) male. I already have one connected there but maybe I need a new one.

 

[rgd1101]

why are you using a extension cable?

 

[carrot__]

why are you using a extension cable?

I am not sure if it's an extension. I already have one from when I bought the computer and it connects my psu to my graphic card. It does not seem to do anything now so I thought of replacing the cable. I mean my graphic card seems to be powered solely from the motherboard and this is where the problem is.

 

[rgd1101]

the gpu have 8 and 6 pin pcie power. both need to plug in