To clear a power-on macro, use the BMPload program, check the “Set Power On Macro” and set the Power On Macro to 0. This will turn the power-on macro feature off. This can also be done via the serial port using the command:
*PONMAC 0 0
will also restore the copyright message usually suppressed when there is a power-on macro assigned.
Similarly, check the “Set Splash Screen” and set Bitmap Number to 0. This will disable the splash screen. The splash screen and power-on macro are typically not set together.