System stop

[Janos Dohanics]

Last night one of my systems stopped, it's FreeBSD 7.4-STABLE, i386.
In /var/log/messages I found this:

Jun 10 23:11:59 mail1 acpi: resumed at 20110610 23:11:59
Jun 10 23:11:59 mail1 postfix/postfix-script[50651]: stopping the Postfix mail system
Jun 10 23:11:59 mail1 postfix/master[92051]: terminating on signal 15
Jun 10 23:11:59 mail1 ntpd[746]: ntpd exiting on signal 15
Jun 10 23:11:59 mail1 syslogd: exiting on signal 15

I guess the entry "acpi: resumed at 20110610 23:11:59" has to do
something with the fact that the system had stopped - would some please
comment on this? Does this entry indicate a hardware failure?

-- 
Janos Dohanics