Release the button while still holding the Power button .
If your printer is displaying an "Ink Absorber Full" error and the cost of professional repair exceeds the value of the printer, is a viable last-ditch effort to save the device. canon service tool v4718
The is a specialized software utility used by technicians and advanced users to perform maintenance and diagnostic tasks on Canon PIXMA printers . Its primary purpose is to address the "Ink Absorber Full" error (error code 5B00 or 5800), which locks the printer once the internal waste ink pads reach their calculated capacity . Key Functions Release the button while still holding the Power button