USB 3.0 Hub attached to a Mac Mini does not work

I have already 2 USB 2.0 hubs attached and work perfectly. I want to add a 3.0 USB powered hub but it does not work. The USB is a Iogear 3.0 USB Hub.
Thank you

Does any USB thing show up?
Of not...
USB reset...
If your Firewire or USB isn't recognizing any device.  A solution which has worked for some whose hard drive became invisible in 10.4 was simply to follow these four steps to reset the Firewire/USB bus:
1. Shut the machine down.
2. UNPLUG the power lead to the computer and any firewire/USB drive or devices.
3. leave it for 10 minutes.
4. Connect back up and reboot.
http://www.macmaps.com/firewirebug2.html

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              [loaded] com.wdc.WDDMservice.plist
              [loaded] com.wdc.WDSmartWareServer.plist
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              [loaded] com.google.keystone.agent.plist
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              Windows Phone 7 Connector Agent
              iAntiVirus
              TextEdit
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              EarthDesk
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              Flash Player
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              Growl
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    Internet Plug-ins:
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              AdobePDFViewer.plugin
              AdobePDFViewerNPAPI.plugin
              Default Browser.plugin
              DirectorShockwave.plugin
              DivXBrowserPlugin.plugin
              Flash Player.plugin
              FlashPlayer-10.6.plugin
              Flip4Mac WMV Plugin.plugin
              iPhotoPhotocast.plugin
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              QuickTime Plugin.plugin
              RealPlayer Plugin.plugin
              SharePointBrowserPlugin.plugin
              Silverlight.plugin
    User Internet Plug-ins:
              Picasa.plugin
              Unity Web Player.plugin
              WebEx.plugin
              WebEx64.plugin
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    Time Machine:
              Time Machine not configured!
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                   2%          WindowServer
                   1%          mds_stores
                   1%          LogMeInGUI
                   1%          RealPlayer Downloader Agent
                   1%          EtreCheck
                   1%          FanControlDaemon
                   0%          uTorrent
                   0%          notifyd
                   0%          networkd
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              1.00 GB            mds
              106 MB             mds_stores
              78 MB              Google Chrome
              49 MB              Finder
              45 MB              WindowServer
              40 MB              Google Chrome Helper
              37 MB              VLC
              29 MB              uTorrent
              20 MB              EtreCheck
              16 MB              DashboardClient
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              989 MB             Active RAM
              934 MB             Inactive RAM
              447 MB             Wired RAM
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