Officejet 8600 Pro+ Power-switch lamp cycling bright then dim

My Officejet 8600 Pro+ printer is brand new, and is connected via my wired network. It's working perfectly so far. Wi-Fi and fax are both (deliberately) turned off / disabled & not needed.
The Power-switch has a nice green light to indicate that the printer has "power" OK - and the lamp seems to have two "on" states, namely 'dim', and 'bright'.
The printer seems to go into "Sleep Mode" OK, and the control panel turns off as expected after my preset "Sleep" interval. (I'm not using the scheduling options.) It also wakes-up OK when I send it a print job. Again, everything is fine so far ...
While the printer is in this low-power 'ECO' state, the intensity of the green Power-switch lamp varies slowly between bright and dim, on a roughly 6-second cycle - 3 seconds at 'bright', then 3 seconds at 'dim', and it never stops cycling - bright then dim then bright etc..
BUT ... and here's my question ... should this lamp be staying 'dim' while the printer is asleep?
Or, does the fact that it is returning to 'bright' every few seconds imply that it is somehow failing to STAY fully 'asleep'?
I can't find any clues about this in the printer's manual.
Perhaps I should raise a query with the HP Support folks, but I thought I'd ask here first.
Thanks in anticipation. Edited to add:
I'd be glad to know whether any other Officejet 8600 owner (or the owner of any other Officejet model) sees this same bright/dim behaviour on their Power-switch lamp? Thanks.

Thanks pcwizard, I got the same reply yesterday from my HP Customer Care enquiry, and I'm satisfied now that my machine isn't cycling repeatedly into sleep mode and then 3 seconds later coming half "out" of sleep mode! I know the HP design folks may never look at these Forum entries, but I'd hint to them that perhaps this ambiguous "sleep" indication might be made an optional choice, so that I could choose a steady low-intensity light instead. It's not an enormous issue of course, but in my little "office" space, this Power button is right in my line-of-sight as I work, and - even though I now know that my printer is perfectly healthy - the slowly-pulsing light had become a recurring distraction until I covered it with a little 'disc' of semi-opaque sticky tape Thanks again.Colin

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Officejet pro 8600 plus power switch light stays on while in sleep mode. is this correct?

officejet pro 8600 plus power switch light stays on while in sleep mode. is this correct?
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The power light will slowly flash on and off when the Officejet Pro 8600 Plus is in a sleep mode state.
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Hello wardell1,
Please take a look at this document and let me know if the troubleshooting steps help resolve your issue.
Good luck!
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Where can I purchase replacement paper trays for the OfficeJet 8600 Pro Plus printer?
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I searched in the online stores available by HP and was unable to find this part. However, I was able to find that the part is available through HP Tech Support by calling in.
Click here to access the full list of HP Tech Support contact numbers.
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Hello dpipitone,
Welcome to the HP Support Forums! I understand you are having some problems printing and scanning wirelessly on your HP OfficeJet Pro 8600 with your Mac running 10.5.8. When you installed the software and drivers for your 8600, did it tell you it was successful and print a test page? Also can you let me know the Exact model of 8600 you are using?
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Let me know if this was successful, I will watch for your reply.
Thank you,
HevnLgh
I work on behalf of HP
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Unable to install HP Officejet 8600 Pro Plus Driver on MacOS Maverick

Hi,
I have not been able to install HP printer driver on my Mac.
printer model: HP Officejet 8600 Pro plus
operating system: MacOS Maverick 10.9.3
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Regards

Hi HugeLau,
I would like to help you successfully install your printer software onto your Mac running mavericks. I can't say for sure what has caused this issue, but I am sure the steps below will help you to resolve the issue;
Scrub/ Uninstall
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Click continue, click on one of the printers in the list.
* Only do this step if you do not have any other HP Printers. Hold down Control, Option and Command, While holding the three buttons down,
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From the computer desktop, double-click the Macintosh HD  icon.
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Double-click the PPDs  folder.
Double-click the Contents  folder.
Double-click the Resources  folder.
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Click the Trash icon on the taskbar, click the Empty  button, and then click OK to empty the trash.
NOTEBy clicking OK, all items in your trash will be permanently deleted from your computer. To delete one item in the trash, click that item to highlight it, and then click OK.
On the upper-left corner of the computer desktop, click the Apple menu icon, and then click System Preferences on the drop-down menu.
Double-click Print & Scan.
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Right-click (or  Ctrl  +click) in the left panel, and then click Reset printing system…
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Repair Disk Permissions
On the Dock, click Applications, and then click Utilities.
Double-click Disk Utility.
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Click the Repair Disk Permissions button at the bottom of the window.
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Select Add other Printer or Scanner
Select the printer you are adding and next to 'Use' you can the printer driver
Please let me know if this resolves the issue. thanks.
Please click the Thumbs up icon below to thank me for responding.
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Sunshyn2005 - I work on behalf of HP

How to cancel a print job on the hp officejet 8600 pro running xp

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scarlattid3,
The cancel button should be located in the bottom right corner of the screen. The only thing is it's not going to show up until you start the print job or copy and then it should appear for you.
Let us know if you are able to find this.
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I'm a printer tech with HP.

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Hi,
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Hi jxj9848,
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If you require further assistance please post back with some additional information including your operating system and version, Mac or Windows?
Please click the Thumbs up icon below to thank me for responding.
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Please click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution.
Sunshyn2005 - I work on behalf of HP

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Setup is in second page after the home screen.
Click on the "Thumbs up"button on the left to say "Thanks"
Please mark the post that solves your problem as "Accepted Solution"
(Although I am employed by HP, I am speaking for myself and not for HP)

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Do you know specifically what piece of Hardware was defective?
I have tried everything suggested to repair the same issue
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Thank You in Advance

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Hello @mjomega,
Welcome to the HP Forums!
I understand your Officejet 8600 is scanning single documents, instead of multiple documents. I will do my best to assist you! When scanning multiple pages, it's a lot easier to perform this option from your computer using the HP software.
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I worked on behalf of HP.

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Hi,
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Hi @darnit7
I would like to help you with this, I found something I am confident will help. Please try the following;
Check that your virus checker is up to date and then run a complete virus scan.
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- source
I hope this help. Thank you for reaching out to the HP forums.
Please click the Thumbs up icon below to thank me for responding.
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Please click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution.
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Officejet 8600 Pro+ Power-switch lamp cycling bright then dim

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