I just accidentally dropped my new laptop from 3 feet

Question

i have pavilion dv6 3050
There was no physical apparent damage and i tried to run a game one after another to be sure till i found a strange appearance at Metro 2033, it has thin black lines on screen even at main menu
i tried to reinstall it but the same
then i changed the vid settings from directx11 to directx10, now it's working!
when i go back to dx11 i get that stupid lines again
the game was running well at the same settings with dx11 but after it was dropped i do not know what happened
sorry for my english

Answer 1

You may have loosened the cable between the LCD and the motherboard. It's not that hard to go in and remove and reconnect, but the steps to do so are beyond me for this specific laptop.
1 of 2 other things may have happened;
the drop may have fractured a solder joint somewhere on the motherboard, and it's losing just enough voltage that the GPU isn't able to process the DX11 instructions where DX10 is just enough less intensive to work.
you may have slightly fractured the LCD itself, and the lines show up in DX11 mode because of the increased detail.
I would run a battery of tests on the machine, including GPU and CPU performance, and stress testing, memory testing, and a dead pixel test (5 single color images viewed in full screen: #000000, #FFFFFF, #FF0000, #00FF00, and #0000FF - pure black, pure white, pure blue, pure green and pure red. )
memtest86+ is a common memory tester, not sure what is usable for CPU and GPU testing these days though.
Hope this helps!
AeSix