Officejet Pro 8500A all lights flash

[cressmanmusic]

All of the lights flash on my printer.  This happens after I have turned it off and on again, and after a while if I haven't printed anything, the lights all begin to flash.  I have unplugged the power cord while on, waited 15 seconds and plugged it in again.  I printed the diagnostic page and it doesn't show any issues.  Please help me fix this annoying problem  I am using wifi to print.

[TEJ1602]

@cressmanmusic, Welcome to HP Support Community!

Follow the steps below to isolate and resolve the issue-

Perform a hard reset-

1. Turn the printer on, if it is not already on.
2. Wait until the printer is idle and silent before you continue.
3. With the printer turned on, disconnect the power cord from the rear of the printer.
4. Unplug the power cord from the wall outlet.
5. Wait at least 60 seconds.
6. Plug the power cord back into the wall outlet.
7. Reconnect the power cord to the rear of the printer.
8. Turn on the printer, if it does not automatically turn on.
9. Wait until the printer is idle and silent before you proceed.

Update the printer firmware-

Download available firmware updates from the HP website

With the printer on and connected to the computer, go to HP Customer Support - Software and Driver Downloads, and then identify your printer. Look for and install any available firmware updates. Refer to the document HP Printers - Updating or Upgrading Printer Firmware

Try printing.

Hope this helps! Keep me posted. 

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