Mac rebooted, don't know why

[Brian White]

>Somewhere in here, my MacPro rebooted.  I don't know why though. 
>This is what is in "All Messages":
>
>22-Mar-08 01:08:42 /System/Library/CoreServices/backupd[75150] 
>Backup completed successfully.
>22-Mar-08 01:10:14 natd[73612] failed to write packet back (No route to host)
>22-Mar-08 01:10:14 natd[73612] failed to write packet back (Host is down)
>22-Mar-08 01:11:33 com.apple.launchctl.System[2] fsck_hfs: Volume is 
>journaled.  No checking performed.
>22-Mar-08 01:11:33 com.apple.launchctl.System[2] fsck_hfs: Use the 
>-f option to force checking.
>22-Mar-08 01:11:44 com.apple.launchctl.System[2] launchctl: Please 
>convert the following to launchd: /etc/mach_init.d/chum.plist
>22-Mar-08 01:11:44 com.apple.launchctl.System[2] launchctl: Please 
>convert the following to launchd: 
>/etc/mach_init.d/dashboardadvisoryd.plist
>22-Mar-08 01:11:44 com.apple.launchctl.System[2] launchctl: Please 
>convert the following to launchd: /etc/mach_init.d/pilotfish.plist
>
>  $ uptime
>  6:37  up  5:26, 2 users, load averages: 2.21 0.90 0.47
>
>My initial suspicion was a power outage (I am between UPSs right 
>now) but the clocks on the oven and microwave were not reset.
>
>Where else can I look?

FWIW, I've had a  few occasions where a power surge rebooted my Mac 
and the various clocks on appliances did not reset.

Brian White