Need to print in color only, I am low on black ink

Assuming the test print page prints using the black ink, printers have a setting that allows you to select black and white printing. If you need further help you need to include the manufacturer and brand of the printer. If the test page doesn't print the black ink and Since you say you have a full black ink cartridge I would also check that you completely removed the plastic tab/sticker that covered the hole the the inks comes out of and that the ink cartridge is securly installed.

If your question means that you are not getting "nice" color copy ... it may be possible that your (color) ink is running low or empty. For instance, if your black ink is low or empty, you will not get the black colors printed ...
So, check to see if your ink cartridges are running low or empty. And if so, see if a (new) replacement cartridge will give you the same result.

No way 2 override the message. Printer works on a combination of both black and color ink to print those perfect pictures and documents. If it is showing color ink needs replacement,you ve 2 change it in order to print even in black and white.

Select true black and white. Any other setting uses the colour cartridge to sharpen the printing.

Try changing printing preferences/properties. Click on option for color, then click on box for "black ink only" or similar. Try now. If you still cannot print after changing preferences/properties, you will need to replace color ink cartridge due to manufacturer's built-in software that prevents printing when ink is low. Great for the ink companies!!!

Check on your color (not mono) ink levels. If they are low, this could cause this.

Technical info: On this printer, envelope text is printed in "composite black" which means we mix the colored inks to make black. This is done for envelopes and not letters because of the ink properties which resist water and smear. If one of the colors is low, you'll get something other than black.

It is a little known fact that ink cartridges do have an expiry date, and it is sometimes possible that even if a printer reads full, that it has dried out and will not print. When you recieve a warning that your ink is too low you will simply be unable to print black ink after a certain point. Generaly if you want to print in only black you will have to do that when you print a document. For instance in IE when you go to file and then print you can select prefrences and select print in greyscale or black. hope this helps!

My HP Deskjet 6940 is not printing. The color (left) low ink light is dark and the black (right) low ink light is flashing. I replaced the black ink cartridge with a new one but the low ink light continues to flash. No tears/rips in the circuit strip and all the copper leads appear to be connected

The light you describe is the ink light.
When that light is blinking, try this.

Turn on the printer. Open the front cover and look at the carrier for the ink cartridges. There is a white arrow right above the latch for the color cartridge.
Once the carrier stops moving, the white arrow should be pointing to a symbol which represents the problem (the reason the light is blinking.) Examples are low ink black, low ink color, sick black ( replace ) , sick color ( replace ).

IF you have just replaced your black cartridge, you might need to replace your color cartridge too.
This printer will not work without both ink cartridges installed and full.
You cant print with a full black and an empty color cartridge unfortunately, even if you only want to print black.

Hope this helps!

Put in a set of new color cartridges and then make sure in the printer settings it is set to Black & White printing only.

Hope this helps

Thanks for reading!