Heb je o.a. deze waarschuwing gezien? "The adjustment is not difficult, but should be performed with extreme caution. Even when the monitor is powered off and unplugged, it still holds enough charge to kill you instantly. IF YOU ARE UNCLEAR OR UNCERTAIN OF WHAT YOU ARE DOING, STOP! TAKE IT TO A CERTIFIED APPLE REPAIR TECHNICIAN."
Niet moeilijk: OK, makkelijk: Nee.
Welke versie Firmware heb je?