[CentOS] centos 5 reboot diagnosis

Hi
 we use cent OS 5.2  on all our production server, just today  one of or
mail server had a reboot and we dont understand why ... usually we  get a
alert if a system was loaded up ... but this system just reboot .... may be
it could be a power failure ...( is there any way to check this ) .. but
that is the last optiopn i am guess as the server is in IDC .   With
dmidecode and biosdecode .. i just get server / bios info . In the Messages
and Dmesgs ... i cant really pin pont  the issue .  Is there any thingi am
not doing or any thing i am supposed to  figure out the reson for this
reboot.

-- 
Regards
Agnello D'souza
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