Late 2011 MacBook Pro; one USB port not recognising anything

Hi,
I've had my MacBook Pro since January 2012, so I believe it is the late 2011 13" model. I'm currently running OSX 10.9 although the problem I've been having has been going on around 3 or 4 months, I think I had OSX 10.7 installed when the problem started.
One of the USB ports on my Mac (the one on the left when looking at them face on) is not recognising my external hard drives, or recognising/charging my iPhone when plugged into the USB. The other USB slot works fine and recognises external hard drives, however when I insert the hard drive into the faulty USB input, although the hard drive lights up and starts whirring as if it is ready to start functioning, it does not appear under the 'Devices' tab of the Finder screen, but does appear and function when using the other port.
Similarly, when I plug my iPhone 5 into the faulty port it is not recognised/does not start charging, however if I leave it running and come back later I often have at least a level of increased battery life which suggests that it does intermittently charge from time to time, and again it functions normally when using the fully functional port.
I've tried the NVRAM reset as I have read in another post but to no avail. Is this likely to be a mechanical fault over a software problem, and if so what could be wrong with it?
Thanks for the help in advance.

thank you shootist, at least now I know the problem is as serious as I dreaded, but will not loose hope waiting for a miracle and the port works again

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PCB Lot Code:          0
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Standby Enabled:          0
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Disk Sleep Timer (Minutes):          10
Display Sleep Timer (Minutes):          5
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Wake on Clamshell Open:          Yes
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Click the [Click for details] links for more information about that line.
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    MacBook Pro (13-inch, Late 2011) (Technical Specifications)
    MacBook Pro - model: MacBookPro8,1
    1 2.4 GHz Intel Core i5 CPU: 2-core
    4 GB RAM Upgradeable
        BANK 0/DIMM0
            2 GB DDR3 1333 MHz ok
        BANK 1/DIMM0
            2 GB DDR3 1333 MHz ok
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    Wireless: en1: 802.11 a/b/g/n
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        Color LCD 1280 x 800
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        EFI (disk0s1) <not mounted> : 210 MB
        Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
        Macintosh HD (disk1) /Volumes/Macintosh HD : 498.88 GB (345.40 GB free)
            Core Storage: disk0s2 499.25 GB Online
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    Apple Inc. FaceTime HD Camera (Built-in)
    Apple Inc. BRCM2070 Hub
        Apple Inc. Bluetooth USB Host Controller
    Apple Inc. Apple Internal Keyboard / Trackpad
    Western Digital My Book 1140 2 TB
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        MBPClone (disk2s2) /Volumes/MBPClone : 249.35 GB (119.30 GB free)
        Recovery HD (disk2s3) <not mounted> [Recovery]: 784 MB
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        MediaorWhatever (disk2s6) / : 665.53 GB (583.65 GB free)
        Recovery HD (disk2s7) <not mounted> [Recovery]: 650 MB
    Apple Computer, Inc. IR Receiver
Thunderbolt Information: ℹ️
    Apple Inc. thunderbolt_bus
Gatekeeper: ℹ️
    Mac App Store and identified developers
Kernel Extensions: ℹ️
        /System/Library/Extensions
    [not loaded]    com.ricoh.print.kext.USBPrintClass (3.01) [Click for support]
        /Volumes/MBPClone/Applications/DiskWarrior.app
    [not loaded]    com.alsoft.Preview (4.4) [Click for support]
        /Volumes/MBPClone/Library/Sophos Anti-Virus/InterCheck.app
    [not loaded]    com.sophos.kext.sav (8.0.14 - SDK 10.5) [Click for support]
Launch Agents: ℹ️
    [loaded]    com.google.keystone.agent.plist [Click for support]
    [running]    net.culater.SIMBL.Agent.plist [Click for support]
Launch Daemons: ℹ️
    [loaded]    com.adobe.fpsaud.plist [Click for support]
    [loaded]    com.bombich.ccc.plist [Click for support]
    [running]    com.bombich.ccchelper.plist [Click for support]
    [loaded]    com.google.keystone.daemon.plist [Click for support]
    [loaded]    com.transcend.TSTRIMHandlerHelp.plist [Click for support]
User Launch Agents: ℹ️
    [loaded]    com.adobe.ARM.[...].plist [Click for support]
User Login Items: ℹ️
    iTunesHelper    Application (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
    WD Quick View    Application (/Library/Application Support/WDSmartware/WDQuickView.app)
Internet Plug-ins: ℹ️
    o1dbrowserplugin: Version: 5.40.2.0 - SDK 10.8 [Click for support]
    Default Browser: Version: 600 - SDK 10.10
    Flip4Mac WMV Plugin: Version: 2.3.2.6 [Click for support]
    OfficeLiveBrowserPlugin: Version: 12.3.6 [Click for support]
    AdobePDFViewerNPAPI: Version: 10.1.13 [Click for support]
    FlashPlayer-10.6: Version: 16.0.0.305 - SDK 10.6 [Click for support]
    Silverlight: Version: 4.0.50917.0 [Click for support]
    Flash Player: Version: 16.0.0.305 - SDK 10.6 Outdated! Update
    QuickTime Plugin: Version: 7.7.3
    googletalkbrowserplugin: Version: 5.40.2.0 - SDK 10.8 [Click for support]
    iPhotoPhotocast: Version: 7.0 - SDK 10.8
    AdobePDFViewer: Version: 10.1.13 [Click for support]
    Scorch: Version: 6.2.0 [Click for support]
    DirectorShockwave: Version: 12.0.7r148 - SDK 10.6 [Click for support]
3rd Party Preference Panes: ℹ️
    Flash Player [Click for support]
    Flip4Mac WMV [Click for support]
    Perian [Click for support]
    WDQuickView [Click for support]
Time Machine: ℹ️
    Mobile backups: OFF
    Auto backup: NO - Auto backup turned off
    Volumes being backed up:
    Destinations:
        MBP Backup [Local]
        Total size: 299.73 GB
        Total number of backups: 20
        Oldest backup: 2013-03-14 16:58:24 +0000
        Last backup: 2014-02-25 16:24:25 +0000
        Size of backup disk: Excellent
            Backup size 299.73 GB > (Disk size 0 B X 3)
Top Processes by CPU: ℹ️
         5%    WindowServer
         3%    mds
         0%    AppleSpell
         0%    fontd
         0%    mds_stores
Top Processes by Memory: ℹ️
    249 MB    mds_stores
    150 MB    Finder
    116 MB    Dock
    116 MB    Spotlight
    73 MB    ocspd
Virtual Memory Information: ℹ️
    801 MB    Free RAM
    1.59 GB    Active RAM
    785 MB    Inactive RAM
    1.09 GB    Wired RAM
    2.01 GB    Page-ins
    446 KB    Page-outs
Diagnostics Information: ℹ️
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    Mar 22, 2015, 10:30:37 PM    /Library/Logs/DiagnosticReports/VideoMemoryTool_2015-03-22-223037_[redacted].cr ash

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7. Quit DU when it is finished and return to the installer. Install Snow Leopard. Download and install Mac OS X 10.6.8 Update Combo v1.1.

Late 2011 MacBook Pro; one USB port not recognising anything

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