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Check out our Black or Color Ink Not Printing, Other Print Quality Issues info about: Print quality and Cartridge Issues.

‎07-14-2026 02:59 PM

HP Recommended

New hp 9730 printer (bought months ago, used only a few times when it stopped working... likely a firmware update issue).  Has new HP genuine cartridges.  Printer prints solid black lines that overlay the text whether printing a Word doc or even just a notepad .txt file (no hidden format or control characters).  

 

Tried typical unplug, hold power button, wait, remove cartridges, then replug in, turn on/connect, insert cartridges.  Checked firmware/drivers -- according to HP support tools online and on my PC, the firmware/drivers are up to date. Recent firmware update July 8 2026 (today is July 14, first time to print since update and it's all black lines.  

 

This "doorstop" can print out the print-head alignment and test pages without the lines, but anything else printed, like txt file, is overlayed with thick black lines.

 

 

20260714_134901 - HP 9730 black lines issue.jpg20260714_134910 - black lines close up.jpg

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