I was using a Canon BJC 2100 and Hewlett Packard Deskjet 540. I had them both connected one to the USB and one to the normal 20 pin connection. One day I received a warning of power surge at the USB port so I inquired about it with a technician and he told me to disconnect one of the cables.
anyway a few weeks ago I started encountering printing problems. I have tried installing new cartridge in BJC 2100 but I still get whie lilnes through the text etc. I have tried cleaning the printer heads. I did the same for my Deskjet 540 but the cartridge leaked through the printer and made quite a mess so I through the old cartridge out and retired the printer. Right now I am using a Canon BJ-200 with the same problem arising. The cartridge is old and not exactly overflowing with ink.
Anyway I am wondering if the problem is with the driver, the port, or is it basically a clooged print head.
Is there anyway to check the integrity of the USB ports.