From your other posts I see that you have resolved the carriage jam message but are still having issues with your printer not printing black, even after replacing the black cartridge.
From a post by Sunshyn2005, to contact HP Support see the following link to create yourself a case number, then call and it may help speed up the call process:
Step 1. Open link: www.hp.com/contacthp/ Step 2. Enter Product number or select to auto detect Step 3. Scroll down to "Still need help? Complete the form to select your contact options" Step 4. Scroll down and click on: HP contact options - click on Get phone number Case number and phone number appear.
You mentioned your printer is under warranty, I suggest you contact HP for warranty repair.