My printer is printing in purple both pictures and text.
Most likely you need to do a deep cleaning of the print head nozzles. Found the following info on ehow.com. It's not your exact model but may lead you in the right direction.
Click on "File" and then "Print" if your printer is an HP 5420v or a 5440 or if it is a 5490 series. A print dialog Box will open. Click on "Properties" and then select the "Service" tab. Open the printer toolbox by clicking on "Service this device." When the "Service" tab appears, click on "Clean the print cartridge." A series of easy-to-follow instructions will appear. You will be allowed up to three levels of cleaning if your print head requires it. Be prepared for your printer to automatically print a test page after each cleaning level--if a test page looks O.K., you can cancel further cleaning.
When this happen to me I did a deep cleaning and it cleared right up.
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