Wont print light flashing - HP Deskjet D1420 InkJet Photo Printer

Try unplugging to reset.

Autosence your printer by turning it off and then hold down the feed button while turning it on and release feed button when light flashes red.

if light is constantly flashing, printer is not print.
printer on and all papers out in printer and light is always on than paper in and print.

Turn the printer on. Remove the cartridges. Gently clean the electric contacts on the cartridges and the cartridge carrier. Put the cartridges back in. If the light is still flashing, and your printer won't print, one of your cartridges is faulty. I suggest you go to the refill shop and consult them which cartridges needs a replacement.
Does any message appears on your monitor when you try to print something? Usually, a message saying "problem with black/color cartridge" or something similar, that's why I am asking.

hold down stop/reset button for 7 sec. If that doesn't work try holding it down for 14 sec.

Check the following:
Make sure you have removed the seal on each cartridge.

Turn of Printer, open all shutters, front and back and close them firmly, firmly.

Make sure there is no paper jam.

Usually these are the immediate causes of this kind of scenario.

Then try to print again.

Here is the owners manual : http://gdlp01.c-wss.com/gds/0900005491/S500usersguide_us.pdf

Try page 144 I believe that is what you are describing.

Recommendation: See HL-5240/HL-5250DN USER'S GUIDE: Section (4), Control Panel: LEDs, (light emitting diodes) starting on pg. 44.

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

return it and never ever buy dell again!!!!