"Printer not connected" message, but printer may end up printing anyways hours after

I'm pretty much helpless after trying reinstalling drivers (the printer is a HP C7180), updating and reconfiguring my router in various ways (Dlink DIR-655, 2.07NA) and trying all types of connections possible for the printer (ethernet, usb, wifi, auto dhcp, fixed adress dhcp), deinstalling and reinstalling the printer in Lion.
The drivers were properly re-downloaded and reinstalled. I followed Apple instructions for this printer under Lion.
The printer will work just after reinstalling from a first computer, but will immediately start behaving strangely after that. Any other computer will be told that the printer is not connected. The job will be put on hold, but it might end up printing an hour or two after that (or never).
I can't tell for sure if the printer is defective. The diagnostic isn't clear at all. I'd buy a new printer, but I'm afraid it might do the same thing, because it could be some problem with the router, for instance. I haven't found anything specific about this type of problem with this router model and this OS version (Lion 10.7.3).
Any idea ?
Z

Hi @lbf626,
Welcome to the HP Forums!
I noticed that you cannot connect your HP Officejet 6500 a plus 710n-z to your MacBook running OS X 10.10.2. I am sorry for the frustration, but I am happy to help!
Please see the following:
'Printer is offline' Message Displays on the Computer and the Printer Does Not Print: Mac OS X. (I would follow the instructions for OS X v10.8 Mountain Lion and OS X v10.9 Mavericks. As it will work on Mac OS X 10.10.2)  
Printer Does Not Maintain Wireless Connection.
Tips for troubleshooting wireless connection issues
The following tips can help you troubleshoot and avoid wireless connectivity issues. You can try these tips separately or in combination to get a successful wireless signal.
Move the printer and the computer closer to the router, but no closer than 6 ft (1.8 m). Wireless signals can be weaker at greater distances between the printer and the router.
If you are experiencing an intermittent wireless connection, try restarting your router. Consult your router manufacturer, Internet service provider, or network administrator for instructions on how to restart the router.
Remove any metal objects between the printer, the computer, and the router. Objects such as refrigerators, microwaves, or metal bookcases can interfere with wireless transmission.
Move any device that emits radio signals, such as microwaves and cordless telephones, farther away from the printer. Such devices can interfere with wireless signals.
Make sure the router is broadcasting at 2.4 ghz and not at 5 ghz.
I would also recommend this website, HP Wireless Printing Center - Troubleshooting Issues.
Hope this information is helpful, and thank you for posting!
RnRMusicMan
I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos Thumbs Up" to say “Thanks” for helping!

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