Fried screen connector?

Hello!
I have one problem with my Presario C700, it had some time ago one problem: Stripes on screen, so I disassembled it and was right, 2 cables from screen cable were torn, so I tried to repair it quickly by solderning these cables back, and insolating them, stripes were gone, but screen was only white, blacked out when switching to OS and white again, with other screen and all new screen cable, the screen is still white, could soldering old cable fry circuit board in MOBO? All the pins in connectors are straight and fitting. Can it be easily fixed?
Cheers!
(Guy at IT repair center said it's graphics problem, and to test it on some GPU benchmark, I didn't believed that GMA965 has broken, so I tested it on furmark as he said, and it's okay, no artifacts etc.)

 

Your post is a bit confusing. So you already replaced the cable and the screen and the display is still white, but you were able to run Furmark without problems. How were you able to run Furmark if the screen is white? Do you mean that an external display works but the laptop's display is white? Please elaborate.

 

I said, The built in screen in laptop is always white, I ran benchmarks and used it on external screen, on which it runs perfectly fine. There's new cable and new screen I had spare, 100% working, still whiteness.

 

The IT person was probably right to assume your graphics adapter is the problem. I had the exact same issue with a Radeon 5850m recently. White screen on laptop display, worked fine with external display.