This may be teaching grandmother to suck eggs...
Are the cartridges fully seated down?
Have you tried with new cartridges (that would confirm if it was a cartridge problem) as sometimes the very very small jets can get blocked and if a solution dries on them it can be very difficult to remove the blockage!
Finally some epson printers have an electronic chip in the print head that detects if everything is ok but those chips do not always send messages when the error is one it does not know. it could be that if yours has a chip like this it is the chip that is awol and that also can be checked with new cartridge!
It seems to me to bhe unlikely that ther eis an electric fault such as cables but have you done a test print page (either from the computer or better many printers have a start up routine that you can hold down a button to force it to print a test page. if that gives blanks seems cartridge problem.
M