All three lights are flashing on my HP Deskjet 6127. I tried unplugging it from the power source and then plugging it back in. When I try to turn it on all three lights flash and it won't turn off with out me unplugging it.

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There are three different colour of lights. All explained here.

blinking information red light - HP Support Community

hp.com https://h30434.www3.hp.com > td-p
Jun 29, 2020 - 1) Take out the cartridges. 2) Unplug the power cord from the printer & wall. 3) Wait for 30 seconds. 4) Plug the power cord back into ...
Missing: 890c ‎' Must include: 890c

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  HP Deskjet Printers - Blinking Lights ' HP® Customer Support

  https://support.hp.com > ca-en > document
  Follow these steps to reset the power module. Disconnect the power cord from the rear of the printer. Unplug the power cord from the electrical outlet. Unplug ...
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  Blinking Lights on the HP Deskjet 900 Printer Series

  https://support.hp.com > us-en > document > bud09170
  These lights can be on, off, or blinking (flashing), depending on the status of the product. Blinking lights can indicate error conditions.

If you are experiencing bugs, glitches or other issues with your Deskjet F335, reset the printer.

1. Press the "On" button to turn off the printer.
   

2. Unplug the power cord from the back of the device.
   

3. Plug the power cord back into the printer.
   

4. Press the "On" button to turn the printer back on.
   

Read more: How to Reset the HP Deskjet F335 ' eHow.com http://www.ehow.com/how_6827213_reset-hp-deskjet-f335.html#ixzz15sv8ybgl

I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_8b8c2cd6ce148309

reset your printer by unplugging it from the power source in the back and leaving it unplugged for about 30 seconds then plug it back in and try agian.

Try cleaning those contact points on the cartidges(looks like gold dots). You can use nails polish remover or surgical spirits. If it's still not working then you should take it to yur nearest dealer for service or repair.

Sounds like your DeskJet 5150 needs to be restarted. Try:

1) Press <Power> button to turn the printer off, then press again to turn it back on
2) If problem persists, turn off the printer
3) Disconnect the power cord from the power source
4) Reconnect the power cord
5) Turn the printer on

hi there i will help you first what you need to do is get a screw driver open the printer up strip it down then get to the cartrage then u shuld beable to deal with that then put the case and everything back in aprt from the cartrage then when you have done that u need to put the cartrage back in it should pop back in just means one of the termimnal are making lights flash about if you need anymore hel p let me know [email protected]

from what I read on line at HP forums unplugging the network cable may fix it. Others sat they had to buy a new printer
HP DJ 6127 after change of the cartridge blink lights nothing else happens

Remove all ink cartridges. Then unplug your printer and plug it in again

If you need further help, I’m available over the phone at https://www.6ya.com/expert/alex_22751bbefa74c3d0

you can download the driver from http://h10025.www1.hp.com/ewfrf/wc/softwareCategory?product=86858&lc=en&cc=us&dlc=en&submit.y=7&submit.x=2&lang=en&cc=us
pick your operating system and that's it job's done.
make sure you unplug the printer first install the driver first and plug the printer when instructed to do so

hope this helps

Issue

The CARTRIDGE light is always on.

Solution

1. Open the top cover.

2. Unplug the power cord from the back of the printer. Unplug the power cord from the power source. Wait one minute.

3. Plug in the power cord to the back of the printer. Plug the power cord to the power source.