SOURCE: HP 6150 printer shutting on and off
Open the unit up, you'll probably find a capacitor inside that doesn't have a flat top like mine. Replace that one from your electronics supply store, usually very cheap.
SOURCE: Improper shut down
test the power outlets where the printer is connected to to be sure that its getting power supply ,you can comfirm this bu conecting another device to that same power outlet,this will comfirm to you if the oulet adapter fuse is blown or the printer power pack is blown .
SOURCE: HP Photosmart C7280 All-in-one has stopped
Just unplug it, wait a few seconds, then plug it in again. That should fix the problem.
I had the same problem - my Photosmart C7280 AIO displayed "Shutting Down" message all night, and would not respond to any buttons on the control panel, even holding down the Power On/Off button got no response. I was worried about a couple of ink cartridges that it had warned were low before I tried to shut down, so I replaced those.
After looking in the manual and online for troubleshooting help from HP and others, and finding nothing but a suggestion to unplug it (not on an HP site), I finally did unplug it, after first disconnecting the USB cable to prevent any trouble due to interaction with my Mac. Then I aited about 30 seconds, plugged it back in, turned it on, and it started up fine, with no apparent problem.
Testimonial: "THANKS!"
SOURCE: My HP C6100 All in one says it was improperly shut
To do a reset
1. Remove all the inks
2. Press and hold both the OK and CANCEL buttons
3. Whilst holding them remove the power cable from the back of the printer
4. Whilst still holding them - push the power cable back in.
5. Continue to hold the buttons for 10 seconds then let go.
6. Wait - it may reboot several times.
7. Go through the setup again and put the inks back
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