yesterday my office printer Epson stylus photo R1900 developed the same problem .it stop printing ( papers come blank), because the workers moved the printer out side my office with out telling me to change the furniture (i am sure it is rough handling) . when reconnected to the computer and try to test it , start up was normal no noises, it take the papers normally but no ink on the papers , nozzle check , head alignment , head cleaning ,uninstalling and reinstalling the driver didn't solve the problem ,Wicreset showed no error. i took it home and i decided to disassemble the printer and see what is wrong. before disassembling i put my fingers on the ribbon like cable of the print head . luckily it fell in my hand (it was disconnected) , i reconnect the cable carefully ,the printer start working as usual.
so probably the problem in your printers is a matter of loose or disconnected cable whether of the print head or in the mother board and not a major print head issue.