Digital BW, The Print

Recently my LM cart in my R2400 printer started skipping, so I decided 
to go with refilling the original Epson carts using MIS procedure which 
uses the Epson cart's fill hole on the bottom and the exit hole also. 
Inserting a syringe into the fill hole which has been opened and fitted 
with a filling device and inserting another syringe into the exit hole 
to catch the overflow ink and foam I proceeded to complete the 
operation successfully. Placing the refilled cart into the printer and 
running a couple of test patterns, I saw the LM was still not firing, 
at which point I put the old cart back into the printer. That cart is 
the MIS replacement carts that are clear and I could see that it was 
full also. I downloaded a LM purge image and ran it through the printer 
several times with no success. No ink is coming out of that particular 
nozzle. I had this happen with an old Epson 1280, which led me to the 
R2400. Has anyone had this problem and successfully solved it. Please 
respond.

Johnny Eades