HP Deskjet 2540 All-in-One Printer - Manual (Page 73)

Identify a defective cartridge
If both the tri-color and black ink cartridge lights are blinking, and the On button light is on, both
cartridges may still have tape on, be very low on ink, or are missing. First make sure that the pink
tape has been removed from both cartridges, and that both ink cartridges are installed. If both ink
cartridge lights are still blinking, then one or both cartridges may be defective. To determine if one
cartridge is defective, do the following:
1. Remove the black ink cartridge.
2. Close the cartridge access door.
3. If the On button light blinks quickly, replace the tri-color cartridge. If the On button light does not
blink, replace the black cartridge.
ENWW Identify a defective cartridge 69