Follow each of these steps until the problem is resolved:
Remove and then reinsert the print cartridge(s) into the printer.
Clean the print cartridges automatically using the Clean Cartridges option in the Printer Assistant.
Manually clean the print cartridges
and print cartridge cradles:
Open the printer cover and wait until the carriage moves to the center.
Press the Power button to turn off the printer.
Disconnect power cord from the back of the printer.
Remove the print cartridges and place them on a piece of paper with the nozzle plate facing up.
Lightly moisten a cotton swab with distilled water.
Clean the face and edges of the print cartridges with the swab. Do not touch the print cartridge ink nozzles or copper contacts.
Wipe the underside of the print cartridge cradle walls using a clean, moistened swab.
Reinsert the print cartridges.
Close the printer cover.
Connect the power cord to the back of the printer.
Press the Power button to turn on the printer.
Calibrate the print cartridges.
If the light is still flashing, replace the print cartridges.