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HP officejet 100 mobile printer shows Printing-Waiting for printer to become available
@dbugman1, Welcome to HP Support Community!
Follow the steps below-
Reset the printer-
Ensure that the printer is up to date with its firmware and Mac is up to date with its software. If you are unsure you may use the links below to update the printer firmware and Mac software:
Update printer firmware
Update software on Mac
Also, Go to System Information to check the USB detection- try different port and cable if not detected.
Keep me posted for further assistance.
TEJ1602 I am an HP Employee
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