HP Officejet Pro 8100 ePrinter - N811a N811d - Manual (Page 145)

NOTE: If your cartridge is still under warranty, contact HP support for service or
replacement. For more information about ink cartridge warranty, see Ink cartridge warranty
information. If the problem persists after you replace the cartridge, contact HP support. For
more information, see HP support.
Replace the ink cartridge 141