I have a Power Mac G4 with Mac OS 9.x connected to a LCD display, I changed the resolution to 1920x1080 but then the display went black, I waited but it didn't change back. So I restarted, the happy mac is visible then the display gets black again. When I start holding shift (extensions off) it boots with a different resolution which allows me to see the system, but I can't open the control panel as extensions are off. After restarting I get a black display again.
What can I do now?