hi,
Please check the following weblink and perform the instructions provided.
http://h10025.www1.hp.com/ewfrf/wc/document?docname=bpu00657&cc=us&lc=en&dlc=en&product=79480
Once you are done with the instructions, perform the following steps:
Connect the All-in-One(Printer) directly to the walloutlet and
1. Verify that the unit is switched on. Unplug the all-in-one from power and disconnect the connection port.
2. Wait 30 seconds.
3. Plug in the power only.
4. Repeat steps 2-4 two more times.
5. On the third time after plugging the unit into power, reconnect the connection port from the all-in-one to your computer.
Now, perform the steps below:
1. Unplug the power cable from printer when the printer is powered on and wait for 20 seconds.
2. Then, press and hold # and 6 while plugging in the power cord
Regards,
Sagarjd