if the problem is persists you have to replace the data cable connected to the head ( this cable goes foward and backward with the movement of the heads and sometimes it brokes ) i had the same problem and the solution is this.
Just one Question?
Do you have your LAN Cable tied with your AC power Cable?
I have th same problem on two VP540 after seven years of trouble free working. A few months ago I was reorganizing my shop and I tied up both cables to avoid tangle cables with machine wheels every time I move It.
I think that the noise produced by AC Voltage Affect the VP540 ethernet port.
your print head dry out, cause is: no use! you should detach the tube between the pump and the caps, the one of magenta and yellow, insert a seringe in the tube (that comes from the cap) and suck some cc´s of ink, .then atatch the tube again and run one or two powerful cleanings, then run the test. A smart advise is: never turn off the machine in the main power, the machine when in stand by, does automatic a check and a cleaning process from time to time if needed.
