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A red-light status indication, means that the printer is in need of something basic:
- paper in paper trays (and since you cannot be sure which, put paper in all trays, incl. the manual feed slot if there is one on your printer model)
- press any Cancel or Start button to try to bring the printer to an Online status.
- make sure there isn't excessive paper loaded in any tray (over 25 sheets can be too much in some printers.)
- clear the printer queue on the computer, turn the printer Off, restart the computer, turn the printer On again once the computer has restarted.
How old is the printer?