HP 74, 75, 74XL, 75XL Cartridge Refills - Solving Errors & Warnings: http://www.youtube.com/watch?v=C5ISTGyScWU
Diagnostic Tap 41 Test (verifies electrical health of ink cartridges): http://www.youtube.com/watch?v=8fE-IM4AVMc
NOTE: To access the diagnostics menu on the HP Officejet J5700 or J6400 series printers, select * and # keys simultaneously and enter 124 (or 123). From there you can access the Reports Menu, 'print-mech tap test and run the diagnostic code=41 test (see video above for reference) - this will tell you the exact health of your ink cartridges. To run it I think you'll need to access via '124' access code for the HP OJ J64xx printer series. For more information, please visit:www.inkjet411.com
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