Laptop won't power off after SMXI install

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http://crunchbanglinux.org – I installed SMXI on my laptop and ever snce then I've noticed an intermittent problem where it will not power off.Shutting down the laptop gives the appearance that everything is shutdown, i get the text display after selecting shutdown and the the screen goes black.  To the casual observer it would appear that the laptop has switched off, however the power LED on the side of the laptop is still on and can only be switched off by holding the power button down.To the best of my knowledge this never happened until after I installed SMXI, so I was wondering if anyone else had come acros (HowTos)