Replaced black ink, printer skips and leaves marks.

This issues looking printer head problem. check the following Steps for cleaning printer head :

Click on the Start button if you have Windows XP. If you have Windows Vista, click the Windows icon that resides in the lower left corner of your computer screen.

Click on "Control Panel," then "Printers and Other Hardware." Finally click on "View Installed Printers or Fax Printers."

Right-click on the name of your printer and choose "Printing Preferences." This should open a new window; next look for a tab or button marked Maintenance, or something similar.

Find the button that says "Print heads" or "Clean the Print heads" and click on it. You may be asked to choose which print heads; choose them all if you are. Make sure there is paper and ink in your printer, and that it is turned on ahead of time.

Take out the page your printer has printed and see if there are any grids or boxes missing. If there aren't, then you can just exit the program--your print heads are not clogged. If there are grids missing, then click on the "Cleaning" or similarly worded button.

Once the cleaning process has completed, print another page to be sure that your print heads are no longer clogged. If they are still clogged, repeat Steps 1-5 until your printer is printing clearly.