Probably a damaged print head.
Sometimes when you clean the print head using a solution, the solution leak to other parts of the print head and damage your print head once you power it on.
It happen mostly when too much pressure is applied when injecting the liquid.
Not sure if you can hear it, but when the print head is sucking ink you can hear a very tiny electronic beep when sucking the ink. If you do not hear this, then the print head is dead.
very interesting detail ... thanks you I can say that my PH has dead. d3am!