>>718795908
Gamecube:
Clean lid sensor switch with deoxit
Clean lens with alcohol on qtip (then dry)
If that fails...
Inspect for damage, spindle motors can be damaged and need to be replaced.
While the console is open activate the lid sensor and see if the laser fires up and motor spins
Lastly recap the disc drive control board underneath the disc drive itself.
Above all, just use a Wii, GC is useless.