Hard reset hp 2820

Have you tried unplugging the printer from the wall for 5 minutes to reset it? If that doesn't work you either have a defective ink cartridge or the printer is defective. Due to the very low prices of new printers replacing it in almost all cases is the cost conscious thing to do.

Have you tried taking the cover off again and seeing if it prints again and if the display is back to normal. That would indicate to me that the problem could be either a wire being loose at the side cover or possibly a sensor, either way you probably need to take it back to the shop to get it repaired.

why not ask at HP. the real makers forum.

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https://h30434.www3.hp.com/

Do NVRAM Initialization for factory default setting. Press & hold enter & * button then turn on the printer, wait till "permanent storage init" appears on display then release the buttons, wait till ready mode comes, check.. I hope it will help you.. But..all setting you will lost like fax,copy,phone book.. be care full.. Best of luck..

Try resetting it. This will erase all stored speed dials etc for the fax, so be warned before doing this.

Disconnect the power from the printer
Press the # and the 6 together on the keypad
Reconnect the power to the printer
Wait for the display to say "Semi NVM reset" (or something like that) OR the printer will shut off.
When either of those occur, release the buttons on the number pad.
If the unit powered down, turn it back on.

The printer will now go through several minutes of gyrations and dancing about and will finish up with a calibration page.

This reset will fix MANY MANY different issues with HP printers, and if you call for tech support, it's usually one of the first things a tech will have you do - so save yourself that 30 minute hold time and do the reset first!

If you have a lot of phone numbers stored in the unit, and don't want to lose them but still want to reset the printer, you can do a partial NVM reset. It doesn't fix as many issues with the printers, but it's less destructive. It's the "pound three" reset.
You guessed it...do exactly as above, but use 3 instead of 6.

The display driver could have crashed, try holding the power button until the lights go off, and the hard drive powers down (you can hear the spinning stop) then try to power it back on. If that doesn't work, do a hard reset, which would be unplugging it from any AC power, and removing the battery and then reconnecting the battery before powering it on. Should this not work, i would say it's safe to assume the backlight is non functioning and a replacement would have to be ordered.

Yes, you will need to replace the drum unit as well. be sure to shop around so you can get the best price because some people mark up the price for that part. You can check the status of your supplies from the printer itself by pushing the "menu" button the printer and scrolling through until you see something about supplies status then press the check mark button.

Have you looked in the rear of the printer at the FUSER unit? Flip the blue levers and the fuser will come out.

Does it work with this error....if so you wanna
make sure that you have a HP cartridge, sometime the chipset is not recongnize....and you have some function that doesn't work. If you try all this, call HP.