10.04 troubleshoot system freeze

[scar]

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i've built a brand-new computer.  it's only role is to run Zoneminder to
handle our security cameras, and allow our employee to use the web
interface to monitor the cameras.

i installed ubuntu 10.04 64-bit on it and the installation went
perfectly fine.  the system will freeze after a random number of days,
though.  i can't ping it, ssh to it, nor use the keyboard/mouse (which
are bluetooth anyway).  the backups it is scheduled to create daily do
not get created until the system is rebooted and running again.  so, it
seems like a complete freeze to me.

i've checked the system log (/var/log/syslog) to see if i notice
anything, but i cannot.

i thought it might be the video drivers, but i actually didn't have the
proprietary drivers installed.  i tried installing the proprietary
drivers anyway just to see, for now.

i've used ubuntu for a few years now on many systems and it's never been
unstable, so i'm thinking it must be a faulty piece of hardware.  i want
to know how i can troubleshoot this.  i've put my dmesg at
http://pastebin.com/Faq7ZqTa

please let me know what steps i can take.  thanks so much

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