Just bought a 17" Philips Magnavox 107S (cm2300) monitor at a flea market for $20. Works great so far: color, no weird lines, or fuzziness. As I tested the front panel buttons I found that the brightness & contrast work, however the main menu doesn't. It displays "OSD Main Menu Locked". Anyone out there wth this type of monitor that has the manual or knows how to remove the lock on the OSD?