HP550 halts and doesn't complete the shutdown

Hi All,
Having a problem with what I believe is acpi. If I press the power button on my laptop or use the shutdown option in xfce, the screen instantly goes dark but the power button continues to glow. I've added a few flags onto the kernel load line in the grub menu file which didn't seem to solve anything.
How can I proceed in getting a proper shutdown or where do I look to establish how to do it?
Thanks

See also: iTunes for Windows: Troubleshooting security software issues
and iOS 5: Updating your device to iOS 5

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    Kernel Version: Darwin 12.5.0
    Boot Mode: Normal
    Model: MacBookPro6,2
    USB
       USB Optical Mouse (KYE Systems Corp.)
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       2014-11-06 iTunes hang
       2014-11-06 iTunes hang
       2014-11-06 iTunes hang
       2014-11-06 iTunes hang
       2014-11-06 iTunes hang
       2014-11-06 iTunes hang
       2014-11-06 iTunes hang
       2014-11-06 iTunes hang
       2014-11-06 iTunes hang
       2014-11-06 iTunes spin
    User diagnostics
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       2014-11-03 CalendarAgent crash
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       Nov 5 02:48:38   wl0: Roamed or switched channel, reason #8, bssid 4a:xx:xx:xx:xx:70
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       Nov 5 08:10:45   SIOCPROTODETACH_IN6: utun0 error=6
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       com.freecom.driver.BoulderScsi (1.0.0d1)
    Extrinsic daemons
       com.bitdefender.CoreIssues
       com.bitdefender.Daemon
       com.bitdefender.UpdDaemon
       com.wdc.WDSmartWareServer
       com.wdc.WDDMservice
       com.trusteer.rooks.rooksd
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       com.oracle.java.JavaUpdateHelper
       com.microsoft.office.licensing.helper
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