Black Lines and dots on my screen

ur graphics card has burned out, same as mine. it happens with aerly models of wiis occasionally. send it to nintendo and theyll replace it

I've never heard of something like this, but I might be able to help. You may already know this, but when a magnet or a speaker is close to a television, the screen may develop a purple or blue spot. Look around your TV for: magnets, speakers, phones and even headphones. If you find anything like this laying around your TV, remove them immediately! As they can leave permanent damage to your TV.

If possible, try hooking your Wii up to another TV and see if you get the same problem. If so, then I'm not quite sure what to do... Sorry, Guess I wasn't much help, huh...? ^-^;

This occurs when you have wiiconnect24 activated, and standby connection activated and console goes to standby connection (yellow led in front), when wii is in standby connection the motherboard and some circuits are active and producing some heat, but the fans are completely off, therefore the console gets overheated overtime..
//baghera

I sent it in and they fixed it. awesome customer service.

yeah i was told my nintendo that my graphics card is faulty, i sent it off and had a new one

It's a problem with the Graphics controller. Contact Nintendo and they will send you a shipping label to send it in. I am going through the process myself as many others have.