USB port with circle around it?

I have a  S855 model and there are apparently 2 USB 3.0 ports and one 2.0 USB port. I have also read that the USB 3.0 ports are blue and the  2.0 is gray or black. this also matches up on what I see on my computer. However,what I am curious about is that one of the 3.0 ports has a oval around it. The other two ports ( one 2.0USB and one 3.0USB) just show a USB insignia withoout the oval around it. What is the oval for. What does it mean? 

It means they support the USB Sleep and Charge function. Your machine may ask about the function when you connect a USB to one of those. Not all machines will support the function and you may have it disabled in your settings.
S70-ABT2N22 Windows 7 Pro & 8.1Pro, C55-A5180 Windows 8.1****Click on White “Kudos” STAR to say thanks!****

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    http://docs.info.apple.com/article.html?artnum=93651
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    Go to folder “My Computer”
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    http://discussions.apple.com/thread.jspa?threadID=501330&tstart=0
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    http://discussions.apple.com/thread.jspa?messageID=2364921&#2364921
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    If you have tried trouble shooting your iPod to no avail after all the steps above, chances are your iPod has a hardware problem. The iPod's built-in Diagnostic Mode is a quick and easy way to determine if you have a "bad" iPod.
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    iPod 4G+ (includes Photo, Nano, Video, and Mini): "Menu" and "Select"
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    iPod 4G+ (includes Photo, Nano, Video, and Mini): "Back" and "Select"
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    Try to do the 5in1, HDD R/W and HDD scan tests. Some successful cases have been reported after the running the few tests under the Diagnostic mode. In case it does not work in your case, and the scan tests reports show some errors then it proves your iPod has a hardware problem and it needs a repairing service.
    B. Format your iPod with a start disk
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    If none of these steps address the issue, your iPod may need to be repaired.
    Consider setting up a mail-in repair for your iPod http://depot.info.apple.com/ipod/
    Or visit your local Apple Retail Store http://www.apple.com/retail/
    In case your iPod is no longer covered by the warranty and you want to find a second repairing company, you can try iPodResQ or ifixit at your own risk
    http://www.ipodresq.com/index.php
    http://www.ifixit.com/
    Just in case that you are at the following situation
    Your iPod warranty is expired
    You don’t want to pay any service charges
    You are prepared to buy a new one
    You can’t accept the re-sell value of your broken iPod
    Rather than leave your iPod as paper-weight or throw it away.
    You can try the following, but again, only do it as your last resort and at your own risk.
    Warning !!!! – It may or may not manage to solve your problem, and with a risk that you may further damage your iPod, which end up as an expensive paper weight or you need to pay more higher repairing cost. Therefore, please re-consider again whether you want to try the next level
    Last Resort Level
    1. . Disconnecting the Hard Drive and battery inside the iPod – Warning !! Your iPod warranty will be waived once you open the iPod.
    In Hong Kong there are some electronic shops offering an iPod service for Sad iPod, the first thing they do is to open up the iPod’s case and disconnecting the battery and the Hard Drive from the main board of the iPod. Wait for 5-10 minutes and reconnecting them back. The reason behind which I can think of is to do a fully reset of a processor of the iPod. In case you want do it itself and you believe that you are good on fixing the electronics devices and have experience to deal with small bits of electronic parts, then you can read the following of how to open the iPod case for battery and HDD replacement (with Quicktimes)
    http://eshop.macsales.com/tech_center/index.cfm?page=Video/directory.html
    2.Press the reset button on the Hard Drive inside the iPod – Suggestion from Kill8joy
    http://discussions.apple.com/thread.jspa?messageID=2438774#2438774
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    Exclamation point and folder and nothing else
    Spank your iPod
    http://www.youtube.com/watch?v=3ljPhrFUaOY
    http://discussions.apple.com/thread.jspa?messageID=3597173#3597173
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    http://discussions.apple.com/thread.jspa?messageID=2831962#2831962
    What should I do with my iPod? Send it or keep it?
    http://discussions.apple.com/thread.jspa?threadID=469080&tstart=0
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    http://discussions.apple.com/thread.jspa?threadID=435160&start=0&tstart=0
    Sad Face on iPod for no apparent reason
    http://discussions.apple.com/thread.jspa?threadID=336342&start=0&tstart=0
    Meeting the Sad iPod icon
    http://askpang.typepad.com/relevanthistory/2004/11/meeting_thesad.html#comment-10519524
    Sad faced iPod, but my computer won’t recognize it?
    http://discussions.apple.com/thread.jspa?messageID=2236095#2236095
    iPod Photo: unhappy icon + warranty question
    http://discussions.apple.com/thread.jspa?messageID=2233746#2233746
    4th Gen iPod Users - are we all having the same problem?
    http://discussions.apple.com/message.jspa?messageID=2235623#2235623
    Low Battery, and clicking sounds
    http://discussions.apple.com/thread.jspa?messageID=2237714#2237714
    Sad faced iPod, but my computer won’t recognize it
    http://discussions.apple.com/thread.jspa?messageID=2242018#2242018
    Sad iPod solution
    http://discussions.apple.com/thread.jspa?threadID=412033&tstart=0
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    http://discussions.apple.com/thread.jspa?messageID=3786084#3786084
    I think my iPod just died its final death
    http://discussions.apple.com/thread.jspa?messageID=3813051
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    http://discussions.apple.com/thread.jspa?messageID=3827167#3827167
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    http://discussions.apple.com/thread.jspa?messageID=4489387#4489387
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