That hit or twist can lead to a very expensive repair.
My Acer Aspire 4750G Has recently been having issues with it's graphics, the pixels start to become white/red/green/blue when I am using anything remotely demanding of the graphics card (YouTube, After Effects) and carries over to more intensive programs such as Dota 2.
The thing about the graphics issue is that when I twist/hit the screen, or even leave the screen alone for 5 minutes with the graphics fault, it normalizes.
Also; because I panicked the first time this happened, I Alt+F4 shut down my computer and turned it back on while the white pixels were still on screen, and when I started the computer back up again, the pixels were still not normalized.
Any thoughts or suggestions are appreciated, thanks!