The Brother MFC -210 does not see the cyan inkcartridge.

The Brother MFC-240C uses an individual cartridge for each color (black, yellow, cyan, and magenta). When one of the colors is out of ink, the printer will tell you to replace the ink cartridge. To replace a cartridge, follow the steps below.

All four cartridges are located on the right front side of the printer, behind a cover. Pull the cover forward from the side, where there is a slight cutout for you to grab. When the cover falls forward, you'll see the ink cartridge holders.

For whichever ink cartridge you are replacing, push down on the purple handle for that color. The ink cartridge holder will open and fall forward, revealing the ink cartridge itself. Push down on the cartridge holder and the cartridge should pop toward you a little bit. Grasp the cartridge and remove it.

Open the new cartridge and remove it from its wrapper. Discard the yellow cover, unless you plan to use it for the old cartridge.

Insert the new cartridge into the correct slot (from left to right: black, yellow, cyan, magenta) so that the word "brother" is right-side up and located toward the top of the cartridge. Once it is most of the way in, push the ink cartridge holder up by the purple handle until it snaps into place. Then close the ink cartridge cover.

If you were out of ink, the machine should recognize the new cartridge and perform its calibration. If it doesn't automatically recognize it, it will ask if you have changed one or more of the cartridges. Press "1" for Yes.

Once you have printed a test page with all four colors to verify that everything is working, either discard the old cartridge in the trash or save it to recycle. But don't get rid of it until you are sure the new cartridge is recognized and working.