Could be your particular monitor has a tough time syncing to the CD32 for some reason. Zenith, Goldstar and Samsung made monitors & TV's often exhibited that problem back in the day. Solution if that's the case is to turn the monitor off and then back on while the CD32 is on, or change inputs and go back to the one that's plugged into the CD32. Color will magically appear (if that's the issue anyway).
