Imac turns off, no apparent reason

my imac suddenly turns off, completely, no apparent reason and intermittently

I'm experiencing similar issues. The iMac will just power down as if the power were pulled from the wall. Screen goes blank and you hear the fan slow and stop. Worried that this will cause problems on the disk. Ever since snow leopard was installed there have been a few issues. This one has been manifesting itself in the last year or so... The console just shows a timestamp for when I turned the machine on but nothing is logged right before the shut down.
  Model Name:    iMac
  Model Identifier:    iMac7,1
  Processor Name:    Intel Core 2 Duo
  Processor Speed:    2.4 GHz
  Number Of Processors:    1
  Total Number Of Cores:    2
  L2 Cache:    4 MB
  Memory:    1 GB
  Bus Speed:    800 MHz
  Boot ROM Version:    IM71.007A.B03
  SMC Version (system):    1.20f4

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