Paper feeds through but comes out blank or nearly blank. On inkjets this is usually clogged nozzles or air in the lines; on lasers it can be tape left on a new toner cartridge.
Work through these in order; most people are fixed by the first two or three.
Use the printer's nozzle check, then run 1–2 head cleanings. Leave it 15–30 minutes and repeat once if needed. Avoid endless cleanings — they waste ink.
Confirm cartridges aren't empty. On a new laser toner, make sure you removed the orange/protective strip before installing.
Remove and firmly reinstall each cartridge until it clicks. For ink tanks, confirm the tanks aren't empty and the transport lock is released.
Set the driver's paper type to match the loaded media so the printer lays down the right amount of ink/toner.
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