I have run out of black ink and need to print some documents off the Internet for a friend, so I copied the text into Word and changed the colour of the text into a sky blue, but when I chose to print, a message appeared saying that the black ink cartridge was not installed and that I can't print to this printer, surely I can print in any colour apart from black if there is no black ink available, why is my computer saying this? Thanks for any help given.
Usually the software provided with the printer stops you from doing this. It's good practise for the manufactures as they get continued sales of cartridges.
If you need to desperately need to print something before being able to buy a new black cartridge try uninstalling the printer software. Please ensure that you DO NOT unistall the drivers or even the printer itself.
Again, I wouldn't recommend doing this if your are not proficient in computer use.
Several printers I've had dealings with refuse to print unless there is a full complement of cartridges present. That means on printers with separate ink tanks for each colour, at least four cartridges present and working.
I've seen one that would print black if the colours were empty but would do it the other way round.