1) If you are looking at the printer FROM THE FRONT, remove the right hand side cover. On most HP printers, there are 2-3 tabs on top that will either pop out with a screwdriver under the top cover, or can be removed with screws. Make sure you have the printer powered off and UNPLUGGED.
2) On the front, bottom, right is a separate piece of plastic that is attached to the side cover that should also be removed. Remove the plastic cover from the side at this point, and you should see a circuit board.
3) There are two ribbon-type connectors on the top [center] of the circuit board that are plugged in directly to the top, inserted towards the bottom of the printer. One is slightly wider than the other. Again, make sure your printer is powered off AND UNPLUGGED. Unplug both of these ribbons [this can be done without removal of the circuit board from the printer, just use care and maybe some forceps or hemostats to help with reinstalling later], and make sure they are not partially plugged in or touching the board.
4) Plug in, and turn back on the printer. A new Ink failure message should come up (the numbers will be different.) Click OK on this, then unplug the printer again.
5) Plug both of these ribbon cables back into their respective connectors. Turn back on the printer. It should start back up, and REINITIALIZE as if you just turned it on for the first time. [The printer will run for a long time pumping fresh ink through the print heads during initialization, so be sure you have cartridges that are fairly new/full.] The ink status will be correct, and no more ink system failure messages.
6) Put back together your printer, it should work."
Also, the other side of the circuit board is where you find the cmos battery. Now if you have ink that has expired just remove this battery for a few minutes and put back in. You should then be able to use those out of date inks and save yourself some money and more importantly look after the environment.
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