Hi cool1,
Welcome to the HP Forums, I hope you enjoy your experience!
I understand the drop light is flashing on the printer.
I will be happy to help you.
The drop light is the cartridge light indicator.
The cartridge is probably low and needs to be changed.
Try and print a Diagnostic page.
Missing Colors in Printout. Go to Solution two: Check for defects using a diagnostic page.
Check the ink levels in Step three.
Here is a document which explains the lights and buttons on the control panel.
This document provides steps in replacing the cartridges.
Please let me know the results.
Thank you for posting on the HP Forums.
Have a nice day!