Recycled Printer Cartridge Level Indicator?

I took my useless HP2600 Printer color cartridge to a recycle cartidge place for the first time. The owner refill the cartridge while I wait for it. He said that it will not show that it is full, but it is. He did a test print from the printer. He have about ten different types of printers in attendance. I came home and it print fine; adjectives of the colors are good. How and when will I know that tape is running low? The picture on my printer before would show the even is getting low. Is this true when you refill a tape that it does not show the level any more? Or, did he not restock it correctly.

Answer:
he did you computer needs restarting

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