What makes the screen jump with black and white lines on P717A-BK

Press and hold the reset button on your tablet for 40 seconds and then re-press. See if that helps.

Send it back for warranty, any attempt to repair will void the warranty.

Plug in the charger and see if that helps.

Try using administrator log in. You may not need pwd.

It's broken :(

There are companies who will replace the screen for about the same price as a brand new Kindle BASIC. personally I would suggest:
- buy a new Kindle BASIC for 59gbp;
or
- download any of the FREE kindle apps and just finish your library reads for free whilst you look around for a replacement.

If you want a TABLET rather than a eReader remember ANY tablet will download the free Kindle app so you can read your books on a Fire or a ASUS or a NEXUS or a iPad or anything really :)

Good luck.

I have a next book and on it has a app called HDMI switch well that keeps coming on and when it comes on my screen goes black and then it will have white lines running threw it or the screen jumps with white lines on it

you should just make someone fix it who are good with electronics

half of the screen is black and other half is white with lines down through it