Clean it, or put it in the other way.
Chat with our AI personalities
If it only does that for a certain disc, then the disc is probably damaged and needs to be replaced. If this happens for all discs, then there is a problem with your disc reader. If that is the case, contact Nintendo and see if they can fix your wii.
Shake the Wii very strong.
try it and find out
Try wiping the disc with a towel or tissue to rub off any dust. There are probably scratches on it. If that doesn't work, your game may have too many scratches.
if the disc reader is lighting, turn on the wii and go to the Wii Message Board it means that you have a new message