something tells me you're having a driver problem, the screen is dying, or the graphics chip is damaged.
for now, download the latest driver for your graphics chip.
if that doesn't work, then it might just be that while you were carrying it, you inadvertently broke something, a.k.a. broke the screen or fudged up the graphics chip. and that's an expensive repair.
up to a few hundred dollars if that's the case.