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‎05-14-2025 03:06 AM

HP Recommended

Recently purchased and installed a black ink cartridges when. I only ever printed black on white. Now, my HP OfficeJet Pro 9730e  won’t work saying I need new colour cartridges. I have never printed in colour. Do I need to buy a new set of cartridges or is this a printer error?

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‎05-14-2025 04:47 AM

HP Recommended

Note that this is a user to user forum and I am just a messenger of this bad news:  According to page 36 of the users manual

 

● Some color ink is used even when printing with black cartridge only

 

This is true for other OEM, not just HP.

 

You may try cleaning the printheads but I suspect you need to replace one of the colored ink cartridges.

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