Interesting situation, but hard to know what to advise on the basis of so little information. Any one coming to a web forum for suggestions should provide all the detail possible that may help those with experience or technical knowledge provide ideas. The first question coming to mind from what you say is that if everything was working beautifully why did you "change out" all the ink on the left side of the printer? The second question is what procedure did you use for "changing it out"? The third question is what procedure did you use for replacing it. Did you replace it all with Epson inks from new cartridges? The fourth question is what "Windex and paper towel tricks" did you use on which components of the head assemblies? Before hearing back from you on any of the questions, I should mention that total blanks in a channel usually indicates not clogs, but rather "drop-outs" or blockages induced by air in the lines. But to be sure one way or another the procedural details are important. Oh - and finally - when you bought this printer second-hand, what did you do to satisfy yourself about the reasons why the seller was selling it and the condition it was in at time of purchase, and what kind of transportation handling did it receive between the seller's location and yours?
