Red stripes on display on laptop?

I drove my laptop down without a hatch yesterday and this morning I had red stripes on the display, every now and then they go away and / or come again. I don't know what's there. Do you think this is a guarantee? And if so how can I report it when I bought the thing on Ebay?

I had the same problem. But I sold the laptop
I think the cable between the board and the monitor is broken or loose.
If your laptop is still under warranty, you can have it repaired free of charge.

It may be due to the GraKa.

or on the screen and its connections to the mainboard. @TimLer