My game cube works fine with all of my games but gives the 'cannot read disk' error message every time I put in my action replay. The action replay is brand new so I know it's not that, and my game cube hasn't been dropped and doesn't have any cracks. Please help!!!

try returning the action replay the one you got may be defective

I have already done that three times =( None of them worked... But thanks for the reply.

That happened to me too. I think some gamecubes are unable to read action replay discs. Because it worked in my friend's gamecube but not mine. Do you have a silver gamecube? Because that's the kind I had and it didn't work. I know the silvers are a little different because they don't have a component video out on the back...