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HP DeskJet Plus 4121 All-in-One Printer
Microsoft Windows 10 (64-bit)

I have come to a point in my printing where a single steady red light appears on the console. I naturally think I am almost out of ink in one color.  But which one? Of course, I would like to know this before I run into town and get another. By the way, looking into the window I note a big zero, then on the right a tube with some vertical stripes, then another tube with a image of a flame in it then on the left another window with solid black. I am sure I am being told that one of my ink cartridges needs replacing but I am not sure of the symbology used.  Can you please help? (For the future, I will write your answer down.)

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