When the paper prints, the color is missing in areas. It looks like a streak mark down the page. The black ink is full color, they yellow and cyan have a white, non-printed streak down the center, and the red is almost empty on the page. (I used the diagnostic tool so I could print each color separately). The toner has been replaced within the last month. Can you tell me what is causing the printer to print this way? Thank you

Tri color cartridge contains Cyan,Magenta & Yellow color inks, mono cartridge contain black ink, combination/mixing with these inks desired color out put will prints on paper.. If any one or more inks are missing/dried, result mis matched print outs on paper.
In your case I feel it's Magenta ink is not firing..,nozzles may clogged, try to clean the nozzles with solvents & try it...If no result ,. replace the color cartridge..

Most likely the cyan ink is burnt. If the ink sticks are left unused (printing more black than color, this will happen.

Print the test pages for PQ troubleshooting from the control panel and examine each print. Cyan will probably have very dark streaks down the page, magenta should look normal, and yellow also will have dark stripes. You need to replace this burnt ink, and the only way is to print. From within paint (or similar accessory in other OS) Create a full page of cyan, and print about 100 - 200 pages, or until the cyan starts to clear up. Yes it is a waste, but much cheaper than a print head, Do this for yellow as well.

Try cleaning nozzle with dry paper towel, cartridge should leave 3 streaks: Yellow, Cyan, Magenta.
If colours on paper seams to be tinted or mixed the cartridge needs to be reclamated, there is no other solution.
If there is an lack of one or more colours try to wipe nozzle with wetted paper towel in window cleaner. After few wipes, 3 colours sholud apper

Sorry, steve, that you are experiencing this problem.

According to canon.com's website regarding the i9900 InkJet Photo Printer:

Why color ink may be used when printing in black and white Even when printing in black and white, color ink is used for the following reasons:

1. Automatic cleaning of the print head.
   
   To prevent the print head nozzles from clogging, the print head is automatically cleaned periodically. At that time, a small amount of each color ink is consumed.
   
   Therefore, although printing in black and white is performed, color ink is also consumed.
   
   
2. Color inks may be used to create black.
   
   When printing in grayscale or on photo paper or when duplex printing, although printing appears in black and white, the color black may be created using the three (cyan, magenta, and yellow) color inks. Printers without a pigment black tank / cartridge will print black / grayscale will create a composite black using color ink even on plain paper.
   
   Therefore, although printing in black and white is performed, color ink may be consumed.
   
3. In order to keep the heavy black ink from smearing on the page or in the printer, color ink is used when duplex printing to help create black text.
   
   ---

I might suggest taking out the color ink cartridges leaving only black there, but some printers don't take kindly to this. So, you may have to further experiment with magenta, cyan, and yellow to make it at least seem b&w to your best eye's judgment.

Good luck on this.

the problem is not with the printer but it is with the ink that might be damaged, this is located inside the printer

I see you don't have much knowledge about printers. It always helps to know something about your printer. It seem you have a color printer. Usually a color printer has two cartridges. Black cartridge and color cartridge. The color cartridge usually contains three colors; cyan, yellow and magenta. If the black cartridge is empty, you won't see black text in the printed paper. Print a small photo and see. If it has all the colors, but looks dull (without proper black color), that means only the black cartridge is empty. If it is greenish, the magenta ink is missing. Generally orange colored printouts suggest cyan is missing. Likewise, purple color means the yellow ink is missing. If you installed the printer properly using the CD from the printer manufacturer, you will be notified when the cartridge is empty or close to run out of ink. But if Windows automatically installed your printer, then the system won't give such information. From the information you have supplied, I believe your blck cartridge is empty or missing. Oh, I almost forgot to say, some manufactures sell some printers (for example some Canon Pixma models) with only the color cartridge. Switch on the printer and open the printer cover. The cartridges will move to the middle. You can check whether the black cartridge is missing. Do not hesitate to contact us for further help.

Hi jepeto997:
Try these steps.
Check for and remove any media, jammed
paper, or debris found in the printers exit
path.
2. Did this correct the problem?
Complete. Go to Step 2.
2 1. Clean the maintenance kit wiper blade or
replace the maintenance kit.
2. Did this correct the problem?
Complete. Go to Step 3.
3 1. Check the exit area, exit frame, the
preheater, maintenance kit, and the
printhead (including the paper release blade)
to see if there is anything touching the drum
assembly.
2. Reseat any printer component interfering or
touching the drum assembly.
If there are streaks on the front side only of a
2-sided print, the preheater may be scraping
ink off the print.
2. Look for ink shavings along the streaks on
the printed paper.
3. Clean the preheater using the Control Panel
Remove Print Smears function.
4. Did this correct the problem?
Complete. Go to Step 5.
5 1. Possible weak or missing jet. Print the weak/
missing jet test print from the Control Panel,
see "Weak/Missing Jet" on page 5-33.
2. Did this correct the problem?
Complete. Go to Step 6.
6 1. Possible discolored jet. Print the solid fill test
print, see "Black, Red, Green, Blue, Cyan,
Magenta, and Yellow Solid Fills" on
page 5-40.
2. Did this correct the problem?
Complete. Go to Step 7.
7 1. The X-axis drive is not functioning correctly.
If the X-Axis Drive does not move the
printhead smoothly and evenly during
printing, vertical lines appear on the print.
For information about X-Axis Drive
problems, see "White Stripes (Pinstripes)"
on page 5-30.
2. Did this correct the problem?
Complete. Go to Step 8.
8 1. Smears on a duplex print can be caused by
the paper preheater operating at a
temperature that is too high or debris is in
the duplex roller or duplex paper path
guides.
2. Run the service diagnostics Duplex Path
test to check the paper preheater’s
temperature.
3. Is the operating temperature within the
correct value range?
the paper preheater operating at a
temperature that is too high or debris is in
the duplex roller or duplex paper path
guides.
2. Run the service diagnostics Duplex Path
test to check the paper preheater’s
temperature.
3. Is the operating temperature within the
correct value range?
Replace the
preheater.
Replace the
electronics
module
Hope this helps
3. Clean the paper release blade.
4. Did this correct the problem?

What you are describing is a bad print head. You can try running the eliminate light stripes several times, and jet substitution, but most likely the print head will have to be replaced to remedy your problem.
You can try googling. Phaser printer print heads or phaser printheads.
There seems to be a secondary market appearing for those print heads. I can tell you from Xerox, if you have no maintenance agreement, they cost $750 per print head.
Honestly, having worked on about every type of color printer known to man, the new solid ink phaser printers, produce a dry ink image of 2400 x 2400 dpi with ink particles that align end to end. The resolution of those printers are remarkable and can be purchased for less than the price of one of those new print heads.
Now for reliable, albeit somewhat not as sharp a color image, but still exceptional, you really can not beat an HP.
The ink stick technology really no longer has the color vividness advantage it initially had. The inks that align end to end, have ended that advantage and are sure a lot cheaper to operate per page.

Resolving white, light lines or streaks (eliminate light stripes)

From the printer, print the Troubleshooting Print Quality Pages.
With Troubleshooting highlighted, press the OK button.
Scroll to Print Quality Problems by pressing the Up or Down Arrow button. Press OK.

Scroll to Troubleshooting Print Quality Page. Press OK.
Evaluate the Light Stripes Test page for missing printhead jets (missing cyan, magenta, yellow or black color bars).

Clean the maintenance unit's wiper blade and empty the waste tray. A dirty maintenance drawer wiper blade can cause white lines and weak or missing printhead jets. Using a clean lint-free cloth or a paper coffee filter, gently clean the blade with a wiping motion across the entire length of the wiper blade.

Normal 0 false false false MicrosoftInternetExplorer4 st1\:*{behavior:url(#ieooui) } /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} Step two: Increase the print quality mode
If reprinting did not help, try increasing the print quality mode.
In the application you are printing from, click File, and then click Print. Make sure the printer is selected, and then click Properties.
Select the Paper/Quality tab. In the Print Quality area, choose the next higher quality setting. If the current setting is Draft, choose Normal. If the current setting is Normal, choose Best.
Step three: Print in grayscale (black area streaking only)
If the streaks are in a black area of a black and white printout, change to grayscale printing.
NOTE:- This step does not apply to color printouts.
In the application you are printing from, click File, and then click Print.
Make sure the printer is selected and click Properties.
Click the Color tab, and select Print Grayscale and High Quality.
Step four: Clean the printheads
If the print quality is still bad, clean the printheads.
Make sure the printer is loaded with unused white paper.
Open HP Solution Center.
Click Settings, Print Settings, and then select Printer Toolbox.
Click the Service Tab.
Click Clean Printhead, and then click Clean.
Step five: Align the printheads
If the print quality is still bad, align the printheads.
Make sure the printer is loaded with unused white paper.
Open the printer Toolbox, and select the Printer Services tab.
Click Align Printheads. The Align Printheads window opens. Click Align.
The printer prints an alignment page. The lines in the patterns should appear to be straight. Click OK when the page finishes printing.
Step six: Calibrate the linefeed
If the print quality is still bad, calibrate the linefeed:
Make sure the printer is loaded with unused white paper.
Open the printer Toolbox and select the Printer Services tab.
Click Calibrate Advanced Linefeed. The Advanced Linefeed Calibration window opens. Click OK .
Step seven: Replace one or both printheads
If the print quality is still bad after performing all the above steps, one or both of the printheads will have to be replaced. Print a PQ Diagnostic page to see which printhead should be replaced.
Make sure the printer is loaded with unused white paper.
Press the Setup button.
Press 1 and * simultaneously.
Look at the color blocks labeled Test Pattern 2. Some or all of them could show white horizontal streaks. If none of the blocks are streaked, the printheads are okay.
If the Black block has lines – replace the KY printhead.
If the Cyan block has lines – replace the MC Printhead.
If the Magenta block has lines – replace the MC Printhead.
If the Red block has lines – replace the KY printhead.
If the Green block has lines – replace the KY printhead.