The fuser temperature might be too low. Check Optimize for: in the Paper tab of your printer
driver, and make sure it is set to the appropriate media. See
Optimizing print quality for media
If toner smears appear on the leading edge of the media, the media guides might be dirty.
Wipe the media guides with a dry, lint-free cloth. See
Cleaning the printer media path
Check the media type and quality.
Try installing a new HP print cartridge. See
Installing a print cartridge