Have you tried doing a 'Restore Factory Defaults'?
Press 'SETUP' until "5:Maintenance" appears, then ENTER
Press the right-arrow until "3:Restore Factory Defaults" appears, then ENTER
It is similair to Resetting the Bios on a PC.
It will wipeout and settings (Time, Date, Speed-Dial numbers, etc..).
If it still does not print correctly after Reset, unplug the Power Cord.
Simultanously press and hold the 6 & # keys and plug the Power Cord in.
It should beep 3 times. Release keys.
Worse HP product ever made (next to the 5L-6L) IMHO 🙂