crashing after install

[jim ruxton]

I just got a new machine and installed FC3 on it. I left it running
overnight and it crashed. There was noise on the monitor when I woke up.
I tried pinging it but it was dead. I reset it and looked
in /var/log/messages but couldn't find anything except a gap between the
last cron event and when I rebooted. After booting up I was mousing
around and the machine froze, this time the last image stayed on the
screen ie. no noise. Again I rebooted but couldn't find anything in the
log files. Should I bring this back to the store? I'm worried the store
will blame the crash on Linux. Any thoughts?
Jim