Power coming FROM external HDD (USB) to MB causing problem?

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1 Dec 2002
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Swindon
I have had a number of problems with my machine recently, and was wondering if my recent discovery could have anything to do with it.. It seems when I plug my external HDD into the USB port the machine will stop half way through the POST.. Take it out and it will work just fine.

I noticed the USB lead coming FROM the HDD (which has its own PSU) has electricity coming through it, could this be causing the motherboard from booting? I know USB has 5v coming from the MB to the HDD, but the other way around?

So, is this normal, and could it cause the problem I am having?
 
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