Vintage Synth Repair

Hi Groupies

I have a Pro88 here that "seems" to boot ok till you want to access ANY commands from the top panel switches.

They all act dead.

First boot up and I hear the SCSI drive make "beep...beep beep"...long pause , repeat. Then  no SCSI spin.

Booting from OS floppy:...Reads then asks for either Enter or Escape.
No switch action so, no further action can be taken.

Equinox logo appears on LCD then displays a voice patch. No sounds. No switch actions.

+ 5 and - 5 volts ok...I havent checked other yet

Any  ideas???

Thanks