Unable to read disc

So I just bought my Gamecube version of the game and my Wii won't "eat" the discs.

I have other GC games as well, which run perfect. Tried to reconnect my memcard and

controllers, to run firstly other GC games (still runned smoothly) and boot as well with

them, then to change to this. No effect, still getting the "unable to read the disc..."

Anyone has got an idea, why this is happening? Thank You in advance!