First I would have a trained service tech examine the machine.
Short of that:
Step by step:
Determine how bad the problem is.
Turn it on and print.
Any nozzles?
Ink in lines?
Ink in dampers.
Headsoak, headsoak, headsoak.
Any nozzles?
If no:
Pull ink through the lines prior to dampers
Any flow?
If no, get a service tech, you have serious issues.
If yes, replace dampers and head.
Syringe from capping station.
If no flow, replace capping station.