Replaced toner but keeps saying replace supply using black only
This happens occasionally with after-market (refurbished) cartridges. Sometimes the people rebuilding the cartridges forget to replace the microchip on the cartridge that resets the copy counter. Most reputable re-manufacturers will send you a replacement cartridge if this happens.
It could also be a carousel alignment or sensor issue inside the printer - if this is the case you will have to call HP for service.
Whatever you do, make sure you do not try to manually rotate the carousel to change out the different cartridges - each time you want to change a specific color, close up the printer first and then press the carousel rotate button that's directly under the ready light, keep pressing until the display says that it's rotating to the color you want, then open and change that color, repeat for each additional color.
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