Prints only top section of test page

well it has got to be the ink cartridge. wipe of the bottom of it and make sure black ink shows up

Click on Start - printersand faxes - right click on your printer - click Properties and then click Print test page.

Check color cartridge good?Go to printer properties > preference>color>remove check mark in print in grey scale.. check for color print..

If the ink cartridges is a refll, generic (not HP), a lot of HP printers will only use HP ink cartridges that is new , no refill's...Sorry I had the same problem...

the body of text of the test page is black ink. From what you describe, the print heads are clogged. Most HPs use cartridges that have the head built in, but if not used for an externded period they can dry up and clog.
Try repeated head cleanings (10 or more) see if any change. If none, try new HP ink cartridges

Try Adding Generic Drivers ( Deskjet 990c ) using Add a Printer Wizard from Printers and Faxes folder

deskjet 920c will not print, green light flashes and blank paper comes out. Printer will print test page perfectly.

Make sure that you are using a postscript driver and not a PCL driver. Many web pages will not print correctly to a PCL printer. Also ensure that the web page your printing is print friendly. Many pages on the web do not print if they use DIV layers. These pages usually have a "print friendly" link somewhere on the page.

This can be a issue with the setting of the page type is off, such as card-stock, transparency and so on. Check to see if the setting for the page type and size are set correctly, ive seen issues like this when the settings are not correct. Let me know if this worked.