How Do I Fix My Xerox Workcenter Pro 32?

I have a Xerox Workcenter Pro 32 it's been a great working machine with no problems until now, when I turn the machine on it seems to take a long time to initialize and when it finally does the touch screen reads :

Communication problem encountered. Reset system by turning power off, then on, using white power switch.

And when I carry out the reset as instructed it takes a bit of time again and comes back to the screen display as above. I've tried un-plugging and re-plugging all the cables from behind the machine and un-plugging the power cord and leaving it for a few hours before trying again but no joy.

an any one help me?