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Our power went out a few nights ago and now the lights just blink and there an "E" on the printer panel. I've turned it off etc and still all lights blinking and an "E" etc.
The printer reads the dates on the printer cartridges which have an expiration date on them. If it's past the date you'll get an E. You'll run into this issue more frequently if you use recycled or refilled cartridges. It's how HP gets you to but their new cartridges. A quick way around it is to try changing your date on your computer. The other way is to buy some brand new cartridges. That might do the trick. It did for me. A little frustrating. I am one who believes in buying recycled cartridges or refilling my old ones. But this printer won't let me.
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Resetting a Hp printer means switching off the machine, removing the cartridges, disconnecting the usb cable and the power chord, leave it off for few minutes then restarting it again without usb cable connected to it and without cartridges installed. You need to press the power button while it boots up. Leave it one for few minutes and again turn it off. Reinstall the cartridges and plug in the usb cable, again Power On the printer. That's all.
But there's another thing when you say all lights are blinking/flashing, there is chance that there's an internal faulty. Clean the cartridges contact point and the contact points on the printer. If possible, clean the printer thoroughly, including the waste ink tank. This will let you help find out the culprit.
Good luck.
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connect the printer directly to the wall jack without the surge protector and the connect the printer.
then pull out the power cable from the back of the printer without shutting it down and pull the cable also out from the walljack wait for 30 seconds then plug the cable into the wall jack and then the printer and see if you still get all your lights blinking.
In addition to providing information about current tasks, the lights on the front panel can also indicate error conditions, as described in the table below: If the On light, Check Print Cartridge light, Check Paper light, and Start Copy, Black and Start Copy, Color lights are all flashing, do the following: 1 Verify that the front-panel overlay is attached to the HPPSC. 2 Turn your HPPSC off and on by disconnecting the power cord and reconnecting.
Alternatively,
All ights blinking: An error caused the HPPSC to stop functioning. 1 Turn the HPPSC off and then on. 2 Restart your computer. 3 If the problem is not corrected, unplug the HPPSC and plug it in again. If the problem persists, contact HP.
This problem occurs for two reasons: the front panel cover was not installed or the ink cartridge access door was not closed before plugging in the all-in-one. The front panel overlay must be correctly installed before the power cord is plugged in. Follow the steps below to correct the problem: Disconnect the power cord. Lift the scanner lid and carefully line up and install the front panel overlay. Plug the power cord in.
Check to see if a connection is loose to the display. If not the board is bad and you might be out of luck. HP pretty much makes these things as "throw away models" now.
lid and carefully line up and install the front panel overlay. 
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