Hi Brian, try resetting--info on page 26 of your manual:
Reset of Microprocessors
In the unlikely event the controls of the C2500 stop
functioning, the microprocessors can be reset by performing
the following:
1. Press and hold the STANDBY/ON Push-button for
approximately ten seconds and then release.
2. To switch the C2500 back On press the On
STANDBY/ON Push-button.
Note: This can be performed with the C2500 On or in
the Standby Mode.
Resetting the C2500 to default settings
If it becomes desirable to reset all the adjustable settings
(Setup and Trim Settings) to the factory default
values, perform the following steps:
1. Press both the PROCESSOR and OUTPUT 2
Push-buttons until the Front Panel Display indicates
“FACTORY RESET”.
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