HP photosmart 6510 stuck in sleep mode

My 6510 once it has been idle anytime from a few hours to several days, the printer will not print anything in the que. I get the message "Printer not Responding". I assume that it is stuck in sleep mode. The only fix is to unplug the power cord and plug it back in. This doesn not solve the problem as I have to do it every time if I haven't printed in a while. I have disabled auto-off but that doesn't seem to work.  Any fixes?

These settings are for setting up your wireless printer to stay connected to your router, keep wireless devices better connected and make your router secure and hack proof.
1. Set a static IP in the printer (click here) outside the DHCP range of the router (check your manual).
   This is for Linksys routers but can be used for all routers. Verify your DHCP range and change this
   first if needed. More Wireless Printing help is here.
2. Verify in the printer that 'Auto Off' is disabled.  Use the Embedded Web Server (EWS) by going to the
   printers IP address in your browsers address bar, click Settings Tab/Auto Off. Or use the Printer
   Assistant, Printer Home Page (EWS).
In the router: (Refer to your router manual for information)
3. Use a fixed wireless channel like 1, 6 or 11, never 'auto', try channel 1 first then the rest. 
4. Set router to 20Mhz only, or 145Mbps depending on router. 
5. Always use WPA2-AES (Personal) encryption, but you can try ‘mixed’ mode. 
6. Disable WPS and never use it and disable UPnP for the routers security. Nobody can hack your
   system now and helps with wireless connectivity (if you want to know why, search the web).
7. If you have a dual band router (2.4Ghz and 5.0Ghz bands), make sure the SSID’s are NOT the same,
   they must be different for all bands, even for any Guest networks.
8. Save all settings. Power off both, wait 2 mins.  Power on router wait 2 mins. 
9. Power on printer and verify it reconnects to router. 
Windows 7/8/8.1   Is Network Discovery on or off?
Control Panel/Network and Internet/Network and Sharing Center/Advanced sharing settings.
Under Home or Work (current profile) / Network Discovery.
Select "Turn on network discovery" and save changes.
Say thanks by clicking the Kudos Thumbs Up to the right in the post.
If my post resolved your problem, please mark it as an Accepted Solution ...
I worked for HP but now I'm retired!

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    Mitan-Patels-iMac-239:~ mitanpatel257905$ Assertion status system-wide:
       PreventUserIdleDisplaySleep             0
       CPUBoundAssertion                       0
       DisableInflow                           0
       ChargeInhibit                           0
       PreventSystemSleep                      0
       PreventUserIdleSystemSleep              0
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    * Kernel Assertion ID = 500
       Created At = 01/01/1970 01:02:35 GMT+
       Modified At = 03/06/2014 09:20:14 GMT+
       Owner ID = 0xffffff80202a3000
       Level = 255
       Assertions Set = None (4)
    * Kernel Assertion ID = 501
       Created At = 01/01/1970 01:02:37 GMT+
       Modified At = 01/01/1970 01:00:00 GMT+
       Owner ID = 0xffffff80202e4000
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       Created At = -bash: Assertion: command not found
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    -bash: CPUBoundAssertion: command not found
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    Mitan-Patels-iMac-239:~ mitanpatel257905$    Owner ID = 0xffffff80202a3000
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    Mitan-Patels-iMac-239:~ mitanpatel257905$    Assertions Set = None (4)
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    -bash: Created: command not found
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    -bash: Modified: command not found
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    -bash: Owner: command not found
    Mitan-Patels-iMac-239:~ mitanpatel257905$    Level = 255
    -bash: Level: command not found
    Mitan-Patels-iMac-239:~ mitanpatel257905$    Assertions Set = None (8)
    -bash: syntax error near unexpected token `('
    Mitan-Patels-iMac-239:~ mitanpatel257905$
    Mitan-Patels-iMac-239:~ mitanpatel257905$  * Kernel Assertion ID = 508
    -bash: HeM+l%AF%DDpȻِ%CF̓%F4%C8O%DE{%AE2ߤ%D8~%E3%EB%8Cؔ%DA%EF: command not found
    Mitan-Patels-iMac-239:~ mitanpatel257905$    Created At = 04/06/2014 00:00:07 GMT+
    -bash: Created: command not found
    Mitan-Patels-iMac-239:~ mitanpatel257905$    Modified At = 01/01/1970 01:00:00 GMT+
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    Mitan-Patels-iMac-239:~ mitanpatel257905$    Level = 255
    -bash: Level: command not found
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