problem with uv sinocolor ufc300c dx8 tx800

[sheep00111]

hi friends in february i import from china a sinocolor ufc 300c the thing is that the machine from the first day makes all but doesent print , test whit two printheads tx800 one new and one tested that they
gave me but the problem still , these time they send me two boards set a main board and a printboard
in this part i install the boards and makes the same issue all works movemnts back and forward ....
but not print in these part i lost the hope , now they wont to send the board and printhead to test ,
wont to re install drivers and connect another pc but when i turn on the machine didnt recognize now
like if it not connected i check all the connections sometimes makes this fault too , i change the board fuses but its not the problem , change the board cables too left some photos here feel free to give some ideas , thanks a lot
left some photos here if you see something it will be helpful

 

[Javier678]

what was the problem?