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This issue is one of two things: a bad cartridge or a bad print head.
Have you tried using another black cartridge?
If the printer is only 3 weeks old then it is covered under warranty and I would recommend returning it back to the store.
If you have any questions, please let me know otherwise if you can take a minute and use the rating system to rate our session as 5 stars and press Submit so I am credited with helping you.
I am checking back up on you about your issue. If the issue is resolved or you do not need anymore help, please rate our session as 5 stars and press Submit so I am credited with helping you otherwise please reply back so we can continue with the issue.
I understand your disappointment since it has to be returned under warranty but please understand that I can only provide accurate information even if it requires the user to send it back for repair/replacement.