I say a dead mobo.
The sounds you usualy hear are HD(s) CD(s) and fans. If the HD(s) are not spinning, that is a good sign that the mobo (IDE controller to be precise) has gone. If the HD(s) died, you would get alot more than just a shutdown. All those things that make sounds are plugged in the mobo, and dead mobo can simply NOT turn on any of them.
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Posting Virtuoso
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since May 2006