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Paper is too thin (use higher "pound" paper).
Toner is not of good quality (use HP Brand if possible)
Printer is set to dark or heavy in your page setup (change to normal or even light)
You can also make sure you are using an HP print driver instead of a generic print driver. Go to HP.com and search print driver for you model, download and install (if you don't already have an HP printer driver loaded on your PC).
This is probably due to a defective cartridge, Charge Roller or Transfer roller.
Check the cartridge for a band of toner still on the drum.
Check the Charge roller for oil or smudges, this roller should be a lighter color and should be relatively free of toner or marks.
Same as the Transfer Roll, which will be dark, though excess toner should be evident.
A relatively smooth straight line is generally the cartridge.
A rather wavey or broken line is most likely the rollers.
You can however attempt to print a large amount of pages (25-50) in an attempt to clean the parts, however if either part is defective they will need to be replaced and no manner of printing will clean them.