Chosen Solution

My Ipod has black spots and lines. I can no longer see the screen.

@terre1109 without actually seeing your screen and only going by your description, it sounds like a bad LCD. To verify this, you can post some images of what your screen looks like with your question. Use this guide for that. To change the LCD go to this guide. Make sure that it is a Classic and not a 5th gen Video that is often mistaken for a Classic.

The battery is expanding inside the iPod. It is likely a safety hazard to try to open it, so you should take great caution if you attempt to repair it.