Are you using Dell Series 9 ink cartridges?
Unplug the printer from the wall. Now remove the power brick from
the back of the printer for 60 seconds. Plug everything back in. This
will reset any error messages the printer has.
Power on the printer. Open the printer and take out the Dell
Series 9 Black cartridge. make sure all the tape is off the cartridge
and put the cartridge back in. Now do the same for the Dell Series 9
You are using Dell Series 9 ink cartridges, correct?
Dell Series 9 ink cartridges have a sensor in them that cannot be reset. Article on refilling Dell ink cartridges
Dell Series 9 ink cartridges can be purchased at Staples, Walmart or Dell's Website
Black cartridge = black side(left side) Color cartridge = color side(right side)
Photo cartridge = black side(left side) Color cartridge = color side(right side)
It is possible to get a Dell Series 9 cartridge with a bad sensor. Contact the place of purchase for a replacement.