Alright, this is a little off topic but good for those who got the Canon PIXMA iP1800 free after rebate or with a PC purchase awhile back. They where practically handing these printers out. My problem is that I was out of color ink and was unable to print because the printer required both cartridges to be full. To fix this you need to go to “Preferences” -> “Maintenance” -> “Ink Cartridge Settings” -> and choose “Black Only“. Thats it.

I have also made an easy to follow visual reference.

  Canon PIXMA iP1800 Visual Reference Guide (397.4 KiB)

(Click to Enlarge)