I have a Canon BJC 620 printer. It was working fine. Now when I turn it on, after 3 or 4 seconds it beeps and the "Error" light and all the ink lights blink. The ink tanks are all full. I went to the Canon help site; they said it might have something to do with the waste ink tank being full. I was able to take it apart, and I cleaned out the waste tank but it still just beeps and blinks. Anybody know what this might be. It's an old printer and long out of warranty, so I doubt it would be worth sending it to a shop. Thanks in advance for any help.