On 5/26/2010 11:55 AM, Darren New wrote:
> That's because computers are really analog devices. If the PSU isn't
> delivering enough voltage or current to keep the thing in spec, it goes
> back to being an analog device (i.e., the circuits aren't driven to
> saturation), and everything that assumes it's behaving digitally stops
> working reliably.

A failing power supply causes a system to act erratically more often due 
to switching noise not being filtered out than to low voltage or 
current.  Typically, the electrolytic filter capacitors start to 
degrade, which allows the switching noise through.  This can cause a bit 
of havoc to ensue in a system.

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