My 2 cents,

Visually inspect the mainboard, if there are no swollen or leaking capacitors then replace the PSU.

Richard Carter wrote:
Hi Szemir,

Thanks for your reply. Perhaps "shutdown" is not the right word. What happens is not "graceful"! The screen goes black and the PC just dies!
Robin

On Wed, Jul 8, 2009 at 9:39 AM, bogi <[email protected] <mailto:[email protected]>> wrote:

    I think you may have a full / <<root partition or a full /home
    partition. I
    don't think a faulty psu would result in a graceful shutdown. A psu
    taking
    the power-good signal away might result in a graceful shutdown, but
    not in
    case power is really not good :-)
    Also a shorted out / stuck  reset button can result in a graceful
    shutdown.
    Knowing your system i would go for the full partition option first.
    Cheers
    Szemir

    On Wednesday 08 July 2009 09:00:23 Richard Carter wrote:
     > Hi Folks,
     >
     > This morning my desk top PC (amd64, Debian 5.0) began spontaneously
     > shutting down.  This happens at various times: part way through
    booting,
     > while in kde, during back up.  I suspect the power supply has
    failed.  Does
     > this sound right?
     >
     > Robin Carter



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