Still using color toner when printing in black

Is the print quality poor on left side for all colors? You may have one bad cartridge. Create a paint document with Yellow, Magenta and Cyan squares on the left side and see if one color prints better than the others. You can also gently shake the cartridges to redistribute toner.

Check your print driver settings. And if you are printing from any of the microsoft office applications look at the page setup to see if something was changed. Click file, then right near print is the page setup.

no. this printer uses a four color black. you are unable to bypass the yellow cartridge.

The ink of your printer seems to be empty. Replace the toner cartriage to solve the problem.

http://www.hp.com/#Support

Follow the link and get the correct driver and get installed

From the User Guide:

Black, Cyan, Magenta, and Yellow Supplies Status lights
These lights indicate when a print cartridge is low (the light is on), or empty or missing (the
light blinks). The lights also indicate when a non-HP print cartridge is installed (the light
blinks and the Attention light is on).

If you don't have a User Guide click on the link below and save it for future reference.


2550n User Guide

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Are you using generic toners or HP branded? Try to reseat the yellow toner. The page counter can't be reset and should not be. This unit uses chips to recognize the toner level. Generic toners don't always have good chips on them.

how to assign the IP address to Hp color laserjet 2550Ln printer?

Have you checked that you are sending the print job using the correct paper tray on the printer? Check the properties of the printer to ensure you are. Check also that the printer is OK by running a test print from the printer and not through the PC. If I remember it's hold the green button for around 7-10 seconds, whilst powering on.

Look at your printer properties and check that you are using the correct tray settings.