HP Officejet PRO 8500A A910 offline - Problem solved.

I am writing this post in hope that it will help some people.

The issue is that an HP Officejet PRO 8500A A910 shows as offline when you open the print queue dialog (in the caption it just says "HP Officejet PRO 8500A A910 - offline"), other then that I had network connectivity, ping, web interface was reachable and so on, It just would not print....

I have seen very long threads where people complain that their HP Officejet PRO 8500A A910 went offline and nothing helped.

They got many types of advice like switching from wireless to USB, changing IP and other network settings, disabling Power save mode , restart the printer or related router, use a different power cable and so on...

For me It turned out that the problem was that the cyan ink cartridge was just too old (two years and two months actually... - looks like I am not printing enough sea images...).

Changing the expired cartridge resolved the issue and the printer just came back online.

So how can you tell if that is the case with you ?

In the printer screen , press the ink icon (the one with the cyan, magenta, yellow & black circles on the top right).

You should see a yellow exclamation sign next to at least one of your ink cartridges.

Press the "More..." button and use the side arrows to brows through the cartridges.

If a cartridge is expired it will say so on the top line of the screen (above the ink level indicator).

Replace the expired cartridge and leave me a comment...

Eyal

1/1/2019: UPDATE (Another solution if the above is not the case for you):
[READ, BUT DONT DO THIS until you read the update below]
This was originally posted on Feb 5th 2106,
It is now Jan 1st 2019, and my printer went offline again....
I did remember that I have bloged about this in the past so I came back here,
only this time the cartridges seem o.k.
so I did some more reading and finnaly arrived at THIS LINK which had the sollution to my current "HP Officejet Pro 8500A Plus is offline" problem.

To sum up:
go to the printer properties, open the ports tab and press the configure port button.
then remove the check box from "SNMP Status Enabled".
printer should go online after you press "OK" and "Close".

I must add here the at first it did not wat to save my change and I deleted all the print jobs from the spooler and tried again and then it saved without a problem.

1/1/2019: UPDATE 2
well, I was too quick to go and blog about this,
although it did remove the offline notice on the printer,
the printer remained unavailable for printing,
digging further, it turned out that I did not have connectivity to my printer... (a cable got loose)
so, I now believe that what you should do if its not a cartridges issue is the following:
press the network icon on your printer, it should show the printer's IP address, try to ping it,
if it does not work... well, test all your cables...
personally I went beck to the SNMP checkbox and turned it back on...