When the control panel has been switched to the correct mode, you must then Shut Down (from the Special menu) and power on the computer. A restart will not work because the computer's Application Specific Integrated Circuits (ASIC) do not get reset unless they are powered off. A hard reset (Control-Command-Power) will reset the ASICs, but you can also corrupt the System file by doing this.
In addition, resetting the PRAM (Option-Command-P-R) at startup will bring the system up in 68000 mode regardless of the setting.
Article Change History:
02 Oct 1996 - Reworded for clarity.