I had this problem on Windows 7 64x.
The solution that finally worked for me:
1. Go to your Devices & Printers window. (from the Start menu)
2. Right-click on your HP CP2025 printer and select Printer Properties.
3. Select the Device Settings tab.
4. Scroll to the bottom where you see Device Type. It probably says "Auto Detect."
5. Click on the words "Auto Detect" to activate a drop-down menu. Select "Color". Click the Apply button.
To test if this fixes your color printing, go to the General tab and click the Print Test Page button at the bottom. The page should print the Windows logo in color at the top of the page (the rest of the page is b&w).
Note: I did not install any additional drivers from HP for this printer. Windows automatically detected it and installed HP's Universal Print Driver PCL 6.
Kudos to Ken from the HP forums for this knowledge:
http://h30499.www3.hp.com/t5/Printers-LaserJet/CP2025-Won-t-Print-in-Color/td-p/1151762
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