Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to refill canon cartridges [title] Make sure the ink cartridge is empty. [substeps] Many canon ink jet cartridges have an electronic device that counts down with every character printed. When the counter reaches 0, you will get an error message on your printer.

Ending1: [title] Place the ink cartridge on a flat surface, preferably a table. [step] Be sure to press the cartridge back and forth if the ink is worn off a bit. Ending2: [title] Follow manufacturer's directions to remove the canon ink jet cartridge. [title] Look to see if the ink reservoir is empty. Ending3: Cartridge cartridges that have a heavy load of ink or that are expired, rely on a liquid ink to reset the ink solution cycle. If you see an error message it probably means the ink may have cooled too quickly or that you will need to inflate the cartridge. Ending4: If this is the case, try a different cartridge to get the same read-over and back up. [title] Go to your printer and turn on the charger.

Answer format: ending1/ending2/ending3/ending4