Lines on the non-touch screen

yes you need a new LCD screen 5-10 on ebay

if its coloured lines then its the bottom screen at fault.

This is a common problem amongst DS lites. It won't go away but it doesn't affect anything so just ignore it.

The only solution is to replace this top screen.

Buy.com has the top screen for $20 Bucks!

Search Top Screen Replacement Display on there.. Hopes this helps.

sounds like possibly the ribbon, should get it checked incase it dies for good.

clean off th game and the gae slot and retr

I know if you use a DS stylus on a DS lite it will mess up the touch screan i dont know what DS you have though and your not suppose to touch the top screan with the stylus. Try reading the DS manual I don't know what to do...

Hi
Your DS is just broke
same proib happened to me, Nintendo wanted 40£ to fix it where you can pick one up for bout 80£

Basically you need a new one =]

If you see lines on either screen of your Nintendo DS Lite during game play, then it is likely one or more of the components that create the image on the screen are damaged. This can occur if there has been an impact -- such as being dropped or hit -- to the Nintendo DS Lite's screens. Phone 1-800-255-3700 to discuss available repair options and they will be grateful to assist you at any time of need.Important Note: If you are seeing lines on the screen that slowly fade away after turning off the system, this is normal.

Have you dropped the DS? It could be that the ribbon cable on the bottom LCD has come adrift.
Does the top screen display the Nintendo logo when switched on?