CURE: For 128K, 512K, 512Ke, or Plus unplug the Macintosh and remove its
battery for 15 seconds or so. This will clear the Macintosh's
parameter RAM.
For NuBus or System 7 Macintosh, hold down Command-option-R-P
until the system sounds the startup chord a second time. Release
the keys.
For SE or SE/30, hold down Command-option-shift and open the
control panel. Release the keys and acknowledge any dialog boxes.
Finally, reset the Control Panel settings.