MACPRO reboots itself

Hi there,
my MACPRO reboots sometimes itself when idle, eg if i convert a movie during the night, in the morning the MAC has rebooted and is waiting for my password.....
Sometimes its standing on the desk without any activity - and reboots - sometimes twice a hour. I have tried so see a pattern in it but without any Luck. Some one has an idea whats the cause and how to get around ....
Cheers Horst

Horst Droege wrote:
my MACPRO reboots sometimes itself when idle, eg if i convert a movie during the night, in the morning the MAC has rebooted and is waiting for my password.....
Sometimes its standing on the desk without any activity - and reboots - sometimes twice a hour. I have tried so see a pattern in it but without any Luck. Some one has an idea whats the cause and how to get around ....
You might learn more about what's causing that by launching the Console utility and looking in "system.log" or "Console Messages" for events that happened around the time of the reboot.

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