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First, turn Off the printer, and unplug it from the power.
Then open the top of the printer, as if to change cartridges. Reach into the printer and carefully pull or propel the carriage into clear view. One the top of the carriage and the cartridge doors are in view, provided that the carriage actually moves freely enough without any force being exerted to move it, remedy the jam, close the cover completely and properly, and see if, when plugged into power and turned On, but with the top of the printer itself still open, the carriage manages to move normally, etc. Then close the top of the printer and see how it behaves.
If that procedure does not bring the printer back into working order, let me know what it does, so that I may advise you further.