Its not a software issue, unless something is getting lost in the translation since he is trying to remotely troubleshoot it.
It is odd that is was working fine in your shop, but now it is not at the user's house. As someone mentioned, it is possible something got jostled loose. CPU would be nearly impossible to come loose. A video card could. It could also be related to bad power in the user's house if replacing the MB doesn't fix it.
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Mokli - Druid of Karana
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