New Mac Pro (quad) does not shut down!

Hey guys
I've just taken delivery of a new Mac Pro for my home music studio, and have loaded up various software such as Native Instruments Komplete, BFD3, Sympobia etc... and Logic Pro X.
In the last two days, whenever I shut down the Mac Pro, it goes to a grey screen (light grey) with the mouse pointer still visible, and then just freezes and doesn't proceed to power off.
Before I provide further information, does anyone have an idea of what might cause this behavour and anything I should be trying to resolve it?
Cheers and thanks,
Mike

yeloop wrote:
...does anyone have an idea of what might cause this behavour and anything I should be trying to resolve it?...
I don't know what might be causing that but one way to find out is to set your Mac to start up and shut down in "verbose mode."
To turn on Verbose booting, at the Terminal type the following:
sudo nvram boot-args="-v"
Disabling Verbose booting is just as easy:
sudo nvram boot-args=
You'll see the various steps the Mac runs through to boot and to shut down. When it hangs, you'll be able to see what point it's hanging at.
BTW, did it behave this way before you loaded up all that software?

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