old redhat box suddenly acting up

[kalin m]

i have this old redhat 7.2 box that suddenly started to act up. it 
restarts all the time and there is nothing in the log but this:

Jul 23 03:06:25 grande syslogd 1.4.1: restart.
Jul 23 03:06:25 grande syslog: syslogd startup succeeded

something somewhare has changed but i can't figure it out. the only 
things running on that box are httpd, dns and ftp but there is nothing 
in those logs that can point to something interesting...

where do i look?

thanks...