Hp 3820 printer cannot print

there are a few steps to take.... try a few head print head cleanings ... then attempt to print a test page ...next clean the catridge contacts as this fixes lots of problems ... just follow the instructions on the hp support site .... a big problem with underused inkjet type printers is the print heads dry out over time... you can rejuvinate a dry print head by removing it and setting it on a moistend papertowel overnight ... use distilled or spring water... you could also simply replace the colour cartridge