I am receiving a erroron my screen of my HP officejet pro 7740 as " Incomoatible cartridges "

[Alliwalli]

I am receiving a erroron my screen of my HP officejet pro 7740 as " Incomoatible cartridges " with a lit up square area on the front screen BUT no other button is lit up and the WiFi button is flashing.

Please help

[Sneha_01]

Hi @Alliwalli,

Welcome to HP Support Community.

Thank you for posting your query, I will be glad to help you.

Resolve cartridge errors for printers that use HP 932, 933, 936, 937, 938, 950, 951, 952, 953, 954, 955, 956, 957, 958, 959, 962, 963, 964, 965, 966, 967, 968, and 969 cartridges.

Perform the following tasks in the order given. Use the printer after each task to see if the issue is resolved.

Check the cartridge numbers

• Make sure the cartridge numbers are compatible with your printer and country/region.
• Open the door or lid to the cartridge access area. Wait until the carriage stops moving before continuing.
• Check the cartridge labels and compare with the list of compatible cartridges for your printer in Which cartridges work with my HP printer?.
• Compare the labels on the cartridges with the labels on the carriage to check that all cartridges are in their correct slots.
• If you saw the error after moving your printer from one country/region to another, you might not find ink cartridges with the number you used to buy. In some cases, you need to contact HP Support for a regionalization reset.
• If your printer is enrolled in Instant Ink, the cartridges should be marked Instant Ink. The numbers may be different from the cartridges available from retailers, but your printer is designed to work with Instant Ink cartridges. See Solve problems with Instant Ink cartridges and enrolled printers for more help with Instant Ink cartridge errors.
• If you have an HP+ printer, see Can't print on an HP+ or Instant Ink enrolled printer for more help.
• NOTE:
• HP+ printers require Original HP cartridges.
• Make sure all the cartridges are firmly seated. If a cartridge is sticking out farther than the others, press it in.
• Replace any incompatible cartridges. Go to the HP Store to purchase compatible cartridges.

Clean the cartridge electrical contacts

• Remove any debris or buildup from the contacts on the cartridges.
• Open the door or lid to the cartridge access area. Wait until the carriage stops moving before continuing.
• Push in on the cartridge indicated in the error message to release it from the carriage.
• Wipe the copper-colored contact on the cartridge with a lint-free cloth. If the copper-colored contact on the cartridge is missing or damaged, the cartridge must be replaced.
• Slide the cartridge into its color-coded slot until it clicks into place.
• Repeat these steps for any other cartridges indicated in the error message.
• Close the door or lid to the cartridge access area.

Replace the problem cartridge

• Installing a new cartridge usually resolves cartridge errors.
• Obtain a replacement cartridge.

Reset the printer

• Reset the printer to recover from printer errors or failures.
• Press the power button to turn off the printer. If the printer does not turn off, disconnect the power cord from the printer.
• Unplug the power cord from the power source.
• Wait 60 seconds.
• Connect the power cord directly to a wall outlet and to the printer.
• Turn on the printer to complete the reset.

Service the printer

I hope this helps.

Take care and have a good day.

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Rachel571 

HP Support