U043 Hi I have just put new cartridges inot my Canon MP600 printer and am getting the above error message. How can i resolve this?

Steps to Troubleshoot Canon Printer Error u043:
Step 1: Open the Paper Output Tray gently after turning off the printer.
Step 2: Pull out the Scanning unit or the Printer Cover totally and remove all the ink tanks not touching the Print Headlock lever.
Step 3: Slightly tilt the print head towards the front of the machine after raising the print head lock lever and thus lift that out gently.
Step 4: Perform the above procedure in the mentioned order: Print Head nozzles -> Electrical Contacts -> Ink Supply Ports.
Step 5: Now Replace the print head carefully back to its position until it clicks.
Step 6: Replace the ink tanks into the Print Head firmly until you hear a click
Step 7: Close the inner cover and the scanning unit carefully, avoiding jam in fingers.
One can easily solve this effectively. https://www.canonprintersupport247.com/blog/fix-canon-printer-error-code-u043/

The U043 error code indicates that an ink tank is not installed. One or more ink tank icons on the LCD should also be lit up. The lit up icon indicates the applicable ink tank. Verify these tanks are indeed fully seated in the print head and that they are lit up red.

You can also press the OK button to clear this message and continue.