HP Officejet Pro 8500 - won't go to "sleep" anymore / occasional mechanical noise

Hi-
I have a HP Officejet Pro 8500 all-in-one wired network printer. Until recently, it used to go into a "sleep" type mode where the screen would go blank and I assume it would entered some sort of power saving mode. Recently, it has stopped doing that. It doesn't every go into sleep mode now, and every 15 mintues or so, it makes a mechanical noise like the moving portion of the printer is cycling briefly on and off.
I don't necessarily care that it doesn't go to sleep, but what concerns me is that the print head "cycling" (for lack of a better term) occuring over and over, every day, for months on end will eventually lead to wear and tear and failure. Is there any way to "force" the printer to go to sleep, or somehow set it up so that it goes into some sort of "sleep" mode after XX amount of minutes?
Thanks!

That is an odd problem, for the most part and like me I am having the exact opposite problem. Once it goes into sleep mode my printer will not even wake up I have to reboot the whole thing. I would say try going and enabling the energy saving mode again and see if that helps.

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I was an HP employee
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http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01980797&tmp_task=solveCategory&cc=us&dlc=en&la...
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Hello FP160,
I see that this is your first visit with us here on the HP Forums. Please let me take a moment to say "Welcome".
To help you get the most out of the HP Forums I would like to direct your attention to the HP Forums Guide First Time Here? Learn How to Post and More.
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Cheers,
Click the “Kudos Thumbs Up" at the bottom of this post to say “Thanks” for helping!
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
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Message Edited by ComSource on 06-15-2009 07:14 AM

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Hello kenishal,
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JERENDS
I work on behalf of HP
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Please click “Accept as Solution ” if you feel my post resolved your issue, as it will help others find the solution faster
Click the “Kudos Thumbs Up" on the right to say “Thanks” for helping!
**MissTeriLynn**
I work on behalf of HP

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I am employed by HP

HP Officejet Pro 8500 - won't go to "sleep" anymore / occasional mechanical noise

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