Is an adaptor cable available rouse to charge a Mac Pro from an auto, either a power point or usb?

Is an adaptor cable available to charge a Mac Pro from an auto power point or usb?

I'm having a very similar problem.
I've got a 2010 iMac that I've got hooked up to my Pioneer Elite via HDMI cable using the Moshi adapter.
It's been working great for months, but today the audio began dropping out -- a fraction of a second, every six seconds or so.
I installed the latest Snow Leopard update today. Does anyone think there might be a connection?
thx!

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    Hi-
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    Benjamin

    It is a 2x2.8 Quad Intel Mac pro, 8GB Ram, 8800 GT Video Card (running dual monitors), 10.6.8, Dual Internal HD (150/250), Single external HD (1TB), Dual Internal Burners (DVD - Stock/Blu-Ray - Pioneer), no PCIe cards installed.
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