When I turn on my tablet I get a white/blank screen with gray lines.

Yve, probably the screen needs replaced.

probably a connection problem with the board inside,below is a link of how it could possibly be fixed

Android Tablet White Screen fix



White screen and lines on tablet repair no video Fix it Fik

Try a factory reset of your tablet first. Here is a link to the procedure:
http://www.rcatablets.com/how-completely-reset-your-rca-android-42-tablet

Sounds like your video processor is faulty or a loose ribbon cable inside your tablet.

holding the power button down until the unit goes off should do the trick.

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

blank screen working fine this morning but can hear sound

Try to hold the slide key for 15 sec. It will reboot your kindle. If black patch is not gone even after that, It's a hw issue. Screen might require to be changed. If it's in warranty Amazon will do it free. That's what i have heard.

Please compare your display to this one:

If your display looks worse, you should contact Amazon Kindle support. This is the current state-of-the-art for E-Ink displays. In comparison, liquid crystal displays (LCD) have a slightly better contrast, but cannot show shades of gray at all, they need electricity all the time, and become much harder to read in brighter environments.

Make sure you have enough light while reading, I find it more comforting to the eyes.

I know this is an old post, but the LED code for CAPS lock on, F4 flashing, F5 on means memory issue. I had this issue, reseated the memory, and the issue was resolved.