Faint horizontal lines while playing games

I have installed my GPU today in my wife's PC. She has a lot of new components as well as some old ones (Majorly being her own GPU which is old)

Unfortunately her 700W PSU didn't have the right connectors (It didn't have 2 PCI 6 pin connectors, only 1 which was put via an adapter to the 2 of the 4 pin ones) so I had to use my own PSU in her PC.

We have ran the test again and the same strips appear on her machine as well, that includes a whole different screen + cables, different ram... An Asus Sabertooth Z77 motherboard and a stronger than mine i5 processor.

That basically leads me to believe that the issue is either the PSU or the card itself which makes me really really pissed >_> Because the card is almost out of warranty, and it has been exchanged already.

Edit:
I unfortunately do not know electronics thus I completely do not understand your explanation Okedokey about the 12v rails and such. Also I am not aware of any lab around me which could test the card for free (Or at all >_>) nor I am really sure what to tell them to begin with. A little advice as to what to ask in a lab/shop would help =)

Thank you very much for the attention so far
 
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Just a little update to let you guys know.

I have gotten a third display to test with. Using the same cables i am using now i've tested it again. The biggest difference however was that the connector at the back of the screen is DVI and not VGA (Like my own screen).
While performing benchmark test as well as trying out all sorts of games - The stripes were nowhere to be seen and everything went smoothly.

After connecting my own monitor back (Which has a VGA connector which connects to my GPU via VGA to DVI cable.... VGA on 1 end and DVI on the other) the stripes came back.

That leads me to the conclusion that the VGA port on my screen and my wifes screen cannot deal with the DVI output from the GPU and does not deliver all the data...

Thank you very much everyone for the attention and suggestions =) You all were really helpful....

So as of right now the issue is resolved, now i just need to get myself a new screen with better connectors

P.S.
I have gotten the idea from my lovely wife which does not know much about PC troubleshooting - Saying that "Maybe the connection is just too old" =D so big thanks to her
 
glad you sorted it. Just for future reference, when we say have you replaced the cable, that means the entire circuit, including the adaptor. We ask this so that we can be sure the physical connection between the two components (monitor and GPU) is working. Unfortunately, had you done that, we wouldn't have gone down the other paths of enquiry.

But, having said that, you needed a new PSU regardless, and the other steps were good practice anyway... again, glad you've sorted it.
 
But i did! =O
I were using a VGA to VGA cable beforehand with a DVI adapter....
After seeing that the issue persisted through 3 adapters, i have swapped to another VGA to VGA cable...
Seeing the issue persisted, i have swapped to a VGA to DVI adapter... It have had 1 connector as a VGA and the other side was a DVI

I did not expect that VGA is so bad.
Not only that, i swapped the entire monitor to a second monitor with it's own set of cables =/
 
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