denford orac

I have acquired a Denford Orac. However every time I power it up or use the reset, the menu appears on the screen and then overwrites itself so that the entire screen is blanked out.

The spindle will turn at minimum speed, but no other control works. (The system just gives an error beep).

I have a feeling that the fault is probably exceedingly simple, but has anyone an idea where I can start?

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