Debian Sarge power down by itself

[jfer]

Debian Sarge power down by itself.
I'm 100% sure it's not the hardware.

I'm new to Linux.

I followed the debian sarge perfect setup without modification.

Does Sarge update itself and powerdown.

Thanks

[falko]

Maybe you had a power blackout?
Do you find anything related to this problem in the logs in /var/log?