Problems printing certain colors

The HP DeskJet 6122 can print with both or only one ink cartridge installed. The printer driver includes an option to print in gray scale as a substitution for color. If you choose to print a document that has a color other than black and white with only a black cartridge installed, I recommend you select the gray scale print option. To select gray scale, select the printer properties and check the box for gray scale rather than color printing. This selection can be made either at the time a document is ready to print (ie., a one time selection, using the "Properties" box in the print options window), OR as a permenant setting using the Control Panel, Printers, HP DeskJet 6122, "Properties" window. Once changed in the general printer properties, these settings remain active anytime the HP DeskJet 6122 printer is selected to print a document.

WORKAROUND: Select EconoFast or Draft as the print quality setting in the printer properties. This will prevent the color cartridge from being used. - Or - Try another color cartridge. The color cartridge is used to print grayscale images in Normal or Best print modes, so if one color has run out, the printout will have the wrong tint. With a full color cartridge, the colors can be properly combined to create a composite black. CAUSE: When printing with Normal or Best as the print quality setting, the HP Deskjet 710C or 720C or 722C series printer will use the color ink to improve print quality output, even when printing a grayscale image.

Dis connect power socket, detach usb cable wait few minutes, connect power switch on printer, check for ready mode, still blinking, remove color/mono cartridges one by one verify,blink gone replace defective cartridge, if problem persists clean encoder strip,disc encoder & paper path sensor..Encoder:Disc encoder
Paper sensor location,sensor visible from backside

try the following
1.power on your peinter
2.while press and hold the power button ,open and close the top cover times.

printer pick the paper and print the test page and alignment pattern for black and color.
if any of the black or color alignment pattern is not print ,then u have to change the cartridge accordingly.

Make certain that the cover is off the jets - if you forgot to pull the strip off or it broke leaving part of the tape on the cartridge, it won't work. Try to do a clean process on the cartridge. If that doesn't work, and you don't have another printer to try the cartridge in, return it to the place you bought it and get another new one. If the printer is printing pink, the color cartridge is probably empty also so that it cannot make black from the other colors. These sound like refilled cartridges - OEMs would have failed with some form of error code or warning.

You can use this page to troubleshoot no color.
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00865420&tmp_task=solveCategory&lc=en&dlc=en&cc=us&product=3311793&lang=en

try to head clean your printer..
follow this steps
1.click start
2.than click printers&faxes
3.right click on hp deskjet printer logo
4.select printing preference tab
5. click on maintenance
6. click on head clean
do it once and try to print some picture with best quality print setting.. and than try to print normaly again.. repeat the steps until the printer normal.
hope this help..

A new ink needs a little cleaning before using. Just dab lightly on a damp paper towel and look for a inch log stripe of each color on the towel. If all colors are not there it won't print very well and you should return the cartridge. Some have reported no yellow in their new cartridges.

reset printer.

ok first u check u install the black catriage. with out black catriage they can not colour print..if u have not install the black catriage and only u install the colour catriage they can not print,,that's why u check catriage. it is complusery to both catriage is install in the printer...