What do I do when all indicator lights (Power, both ink cartridge lights, and warning light) are flashing at the same time?
The printer is in an error state and needs to be reset. Turn off the product, unplug the power cord, wait one minute, then plug the power cord back in and turn the product on. If the problem persists, contact HP support. (Page 9)
From the official HP Deskjet 1050 All-in-One Printer Series J4 manual, page 9
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