The solution offered last time has failed. The sign has reappeared "Ink system has failed.
I have turned off the power for 10seconds, and turned off power, removed cartridges, turned on power...
There is a chance that there is something physically wrong with your printer. Maybe a gear is broken or came off, or maybe a pump or tube is clogged. But most of the time a cold reset will sold the ink system failure error. Here's the procedure for the cold reset:
1- Turn off power and unplug from power source.
2- Open right side of printer (looking at the front).
3- Disconect,by pulling gently, the flat ribbon cable off the main circuit board that is the smaller of the two.
4- Plug in power source and turn printer on. Wait till you hear no more movement from inside from unit booting up.
5- Press both cancel and power button at the same time.
6- Message on printer screen will be, "Enter Special Key Combo".
7- Push keys; Left-Ok-Right.
8- When printer screen changes, scan through and look for "System Menu" and push "Ok"
9- Scan agan and look for "Clean Derivative" and push "Ok". [WAIT FOR 1 MINUTE].
10- Scan agan and look for "Clean Firms" and push "Ok". [Again WAIT FOR 1 MINUTE]
11- Press "Cancel" 4 times
12- Turn off power and unplug from power source. [NOW WAIT FOR 2 MINUTES].
13- Reconect the flat ribbon cable by aligning and carefully pushing into the conector on the main circuit board.
14- Plug in power source,and turn on power.
15- When printer boots up, answer the questions on the printer screen for your area.
16- The printer will cycle the ink from the cartridges to the print head and back.
If this doesn't clear your error then there may be something broken inside your printer. If you still have warranty then I would have the unit replaced. If you don't have warranty then it might be cheaper to buy a new printer that has warranty.