I have a Lexmark color printer, I can't find where the ink goes in?

when your black cartridge goes empty , the printer automatically goes into the reserve mode where it mix up the colors in the color cartridge to produce black color

Lexmark 27 Ink Cartridge, Lexmark 10N0227 - Color
Lexmark 17 Ink Cartridge, Lexmark 10N0217 - Black
Lexmark 16 Ink Cartridge, Lexmark 10N0016 - Black
Lexmark 26 Ink Cartridge, Lexmark 10N0026 - Color

Make sure you are inserting the correct versions of cartridges for your model. Try to re-seat the cartridges by removing and re-inserting the cartridges in the carrier. The black cartridge goes in the left carrier while the color goes in the right. Also, make sure you are using genuine Lexmark cartridges.

Facing the X3350, the black ink cartridge goes on the left, the color on the right

Need more info. Any error messages? Did it just stop pumping ink on paper. Are you trying to print black text or color picture? If no error, your cartridges may be empty. If black text does not work, try color picture. Usually one cartridge goes empty and the other still has ink. If color pic prints replace black cartridge. If neither black or color prints at all, it may be a toasted printhead

If you need to reinstall the software, uninstall it, then go to lexmark.com and get new drivers from their site. RESTART COMPUTER! Reinstall from the downloaded file.

If all the above fail to make it work, it is hosed, shop for new printer.

This is the only information I could find. Didn't your printer come with a black and color ink cartridge? If it did, all you need to do is take the ink cartridge out and write down the numbers written on the cartridge. The only ink cartridge I could positively confirm was the #24 color ink cartridge. The Lexmark website does not list any black ink cartridges for this model. This information was obtained from Officemax.com.
Lexmark - 24 Ink Cartridge - Color
Compatible with Lexmark Z1400 series, X3500 series and X4500 series printers;
Lexmark - 23 Ink Cartridge - Black
Compatible with Z1400 series, X3500 series and X4500 series printers;

did you tried to set the properties to mono ?

To open the printer, just above the front control panel you use both hands & pull upwards. The whole top of the printer will open up. The ink cartrifges will be close to the center of the opening. The printer should be on for this. There are two ink cartrages. The one with the black lid is for your black ink. There is a small tab in front of the cartridge lid. Push down on the tab & the lid will open. Remove the old ink. Remove the tape that is protecting the the bottom & copper back side of the new ink. Place the ink into the printer. The copper back that runs from the bottom & up the back side about 3/4" goes into the printer cartridge. The colored ink goes into the other cartridge holder, it's lid is blue. Again press the tab just in front of the lid & it will pop open. Repeat the above removing the protective tape & install the ink.
The ptinter will want to run either a test page or allignment page or both. You will need your manual. If you do not have your manual you can download it from this site. Click the link below.
http://www.retrevo.com/search/v2/jsp/downloadPage.jsp?doc=f7f0a21c03aee016b79da0cdbb74cf9f&q=Lexmark+X5470
Click "Start download" & save it to your Pc.
Have fun!
please vote...

Make sure you are using the correct cartridges for the Z35. They should be #26 (color) and #16 (black).

Make sure the contacts are clean where the cartridge connects to the printer electrically. A little alcohol wipe is good for this. Clean contacts on both the cartridge and the carrier in the printer.

Make sure the printer settings are set properly to print in color on the PC. Even if there is a color cartridge, if the PC only tells it to print black ink it's not going to use the color cartridge.