You might have to buy a new one but lets see if we can do anything else here. Maybe your disk is just to cracked, i hate that myself, why I hate CDS. If not try putting equal aprts windex and water on the end of a q-tip and clean that one optical thing at the end of the Gamecube when you pop the lid. Just becareful not ot touch it. But try to see if it is just the disk. IF not you might have to get a new one , or repair that one