Dana I am now having again a problem with the printer recognizing the cart on the left side of the printer. Upon startup I get a error that there is no "Cyan" cart and please install a new cart. I open the left side cart door, wait 30-45 seconds, and close. The printer starts to reset for about 5 seconds, and then goes back into no Cyan cart. Repete again without touching the carts, and then I get the whole left side ( all 6 carts ) saying no cart error. Shut down, wait 60+ seconds, and restart, again back to all 6 carts not recognized. I unplug the printer from the wall power, and let set for 15 min. and restart, Again the cyan error, and followed by the left side error.
I have already Mickey Moused the carts with the card stock on the side to better fit to the left side on the cart slots, and that seemed to help a bit up until this week, when I started to get the left side error again. I have restarted the printer 20+ times, with and without the cart door open, and with and without the wall plug pulled. I have "reset to full" all the chips with the power unplugged, and that did not make any difference.
New 9900 printer Aug 5th 2015, and your carts were immediately installed after initial charging of the Epson inks.