Every couple of days my computer freezes hard and I'm not sure how to debug
it.

When it freezes Mouse and keyboard don't work, and I can't SSH in. There's
no disk activity either. The screen continues to display whatever it was
showing.

In the past, when I got  freezes I could do a SysRq-REISUB safe reboot, but
even that fails this time.

I ran a full memtest86 test and everything passed.

I don't know how to force it to occur. I usually have Firefox, some
terminals and pidgin open. Sometimes Thunderbird and VirtualBox are also
open, but not always.

I'm running Debian Wheezy, 64 bit on a Thinkpad W530

I'd really like to avoid a reinstall if I can.

Thanks,
Michael
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