All lights flashing on HP psc 1350 printer
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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