System locking up - trying to pin down why.

Recently my Lenovo SL 500 has been locking up completely using Arch x86_64 running kernel 2.6.31-ARCH. Its complete system hang, not just X. In fact, the laptop actually flashes the capslock LED when it happens.
So far, I have not been able to pin it down to anything, it doesnt seem to happen while running any program in particular.
#cat /var/log/*.log.* | panic or segfault or segmentation doest return anything.
Any ideas of how I can try and narrow the culprit down? Or could it be hardware?
Should I run a memtest?
Thanks for you help.

Please run memtest. Also post system log somewhere on pastebin.

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