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This is because you have created a bubble of air between the cartridge and the print head. The procedure to cure this is as follows:

• Take a priming tool and carefully insert the nozzle into the exit hole on the bottom of the cartridge.
• Slowly withdraw the plunger until ink is drawn into the priming tool.
• Immediately replace the cartridge in the printer.

This can be quite a messy job and precautions should be made before carrying out this procedure to cover work surfaces and wear protective gloves.