Thanks for the additional information, and for checking the forum for possible solutions. The left nudging trick is specific to the 7890/9890 and 7900/9900 cartridges, though sometimes customers have added a small wedge of paper under the 3800/3880 carts to get a good connection between the cart chip and printer' chip sensor. I have added info for that below:
Occasionally one cart can not have a tight connection between the chip and printer's chip sensor, which can cause all carts to read "no cart". In my experience, this one cartridge position is often the yellow for some reason (I don't know how the chip sensors are programmed/configured, so the Y may somehow be tied in with the other differently?).
Please unlock all 9 carts, then push them all back in snugly, while watching the printer's LCD panel. When the LCD says "cartridge door open, close door" is when it sees all the cartridge chips, and it's ok to close the door (but, if it says "no cart" or a similar message, then it's not time to close the door). On a rare occurrence, when one cartridge chip doesn't have a tight connection with the chip sensor, adding a thin wedge of paper under the cart makes a good connection for consistent/good read. To do this, take a piece of regular typing paper, about 3x4", and fold it in 1/2 twice so you have a 3x1" folded strip. tape the paper wedge to the bottom of the cart, and insert the cartridge into the printer so it locks into place.
So, your VM and Y cartridge positions are blinking on the LCD panel, and the error displayed is "NO cartridge" or a different message?
It's normal for only one black to be displayed, and the other grayed out- this is the same when using Epson carts, and shows which black ink is being used (referred to as the black ink mode).
Please let me know, thanks~ Dana