new printhead and ink cartridges in my Epson 7800 won't print

I have a new printhead and new ink cartridges in my Epson stylus pro 7800. No error messages at startup. I have run power cleans with negative results, test prints and printhead alignments with negative results or error messages as well. I am able to manually pull in through the dampers and lines with a syringe. The printer runs smoothly, sounds normal and appears to function as normal but there is no ink visually running through the lines. and nothing being transferred to the paper. Please help.