#1 Refilled Canon Printhead Failure: it is NOT clogged!

Some failed printheads produce a similar nozzle check pattern as a clogged printhead. We found a pattern is almost a sure sign of a failed printhead. We tried 5 different ways to unclog it but failed all of them.
0:00 How to Read a Nozzle Check Page
8:00 Unclogging with Priming Clips
8:56 Boiling Water
9:30 Ultrasonic Cleaning
10:00 High-Pressure Steaming
10:33 Vacuum Hose

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