Digital BW, The Print

I recently bought a used Epson 7600 printer to dedicate to B/W.

When I got the printer to my studio and did a nozzle check the pattern was all broken up.

Tried Windex on the pads, tried flush fluid. It helped but the yellow totally quit working. Thinking that there might be some clotted ink in the lines - I used a syringe to suck all the old ink out of the lines. Then I replaced the yellow damper.
 
Now the machine has quit drawing ink into the dampers. On an initial fill the printer goes through all the motions but does not draw ink from any of the lines. 

I have re-set the dampers a couple of times and am pretty sure they are in there nice and tight. 

I'm fresh out of ideas.
 
Any suggestions would be appreciated. 
Yes, I've seriously thought about the dumpster.

Thanks,
Michael Turner