Pple 24" LED and Mac Pro usb connection problem

Hi,
I'm having issues with my Mac Pro 8 core (2008) connected to an Apple 24" LED. I have a Radeon HD 4870 graphics card installed in the Mac so I can use the Apple LED mini displayport connection. The video works perfectly fine but to use the built-in speakers and iSight in the Apple LED I have to use the USB cables and connect them to the USB sockets of the Mac Pro. This is where the problem seems to be as after a time using the Mac it crashes in a strange manner and I get a few lines of coding and the Mac shuts down on its own. I've used Dr Botts extension cables to extend to reach of the USB cables which I thought maybe the issues and taken this off and I've also unplugged any devices plugged into the extra USB sockets on the Apple LED. I think it's something to do with using the speakers as playing video seems to crash the Mac also but once I unplug the USB cables the video plays fine, but without speaker sound. Has anyone had similar problems and have any solutions?
Thanks in advance.
Alec

I have had no problem at all.
Assume you have considered: http://support.apple.com/kb/TS2400
If you have concerns about possible extension cable reliablity, you might want to consider trying a spare such as this one that is available from the Store: http://store.apple.com/us/product/H6730LL/A/
Mac Pro Quad Core (Early09) 2.93Ghz OSX 10.7.2 24" LED Cinema Display

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