What were result of memtest as suggested by Jim? I had recently run memtest of a server that was showing some thing similar behaviour (main difference it would also lock up without any client connected but user logged in from console). The results showed errors and the memtest would lock up particularly when switching low memory range to higher side for testing the low range at almost end of any test and before starting the next test. If I ran single test everything would be fine. Changing memory resulted in machine running without a break for last two weeks and of course memtest running without error. Of course the hardware vendor is not amused and all he says is that memory is okay as running it on win machine has not shown any adverse result ....yet!!
Just one comment...
Memtest is fine for some memory problems, but I have had more than one case of bad ram that tested fine in memtest. The only 'test' that seems to work reliably for me is compiling some large program in Linux - Openoffice.org, or X, or something like that. If the compilation fails at random points with a segfault, change out the RAM and retry.
Fwiw...
Charles
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