There should be a fault code listed which would narrow down the problem and therefore the solution.
Blindly speaking. Do the following:
2. Verify it is not listing any consumables as "replace now"
3. Do a Reset: as "admin" go to Machine Status > Tools > Troubleshooting > Software Reset > Reset Both > Confirm
4. Upgrade to the latest firmware
xerox workcentre 5765 is showing copying and printing are unavailable please help me with this problem.