Hi simsjs,

Did you buy an original HP cartridge new, or was it an off brand? 

Mind Over Matt'er - Technology musings, opinion, and more straight from TechLore's head geek.

Here are the general guidelines to follow if you install a new ink cartridge and the ink light remains lit:

Open the lid, wait for the print cartridge to move to the right. Remove the cartridge and double check that all of the plastic tab covering the print head contacts has been removed.

If that doesn't work, try re-seating the cartridge plus removing and reinstalling the paper.

Then, try printing a demo page by pressing and holding the Stop button while simultaneously pressing the "minus" volume button five times (while continuing to hold down the Stop button). You should hear a chime and after a minute, a demo page should print out. If it doesn't you could have a defective ink cartridge (even if brand new).

If after trying another brand new ink cartridge the Presto HP Printing Mailbox will not operate, you should contact Presto service at 1-866-428-0970 to initiate a return procedure. We're sorry you are having this problem. It is not typical for Presto users. Please try the above and let us know if it worked or how we can next help.

Presto Insider: Peter Radsliff
CEO, Presto Services Inc.

Occasionally cartridges are defective. After trying Peter's suggestions, I would definitely return the cartridge to the store and get a new one.