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This sounds like a hardware problem, likely either bad ram or
something overheating. Try running memtest86 for several hours
and see what it discovers. Also check the fans and see if warm
air is being ejected.
Doesnt look like a memory problem. Shutdown a number of services including vbox and libvirt services. Still same problem. Is 28 degrees Celcius too high for a CPU temp? What temperature is being reported by /proc/acpi/thermal_zone/thrm/temperature? Room temp? I think I have seen this at 40C, but currently it is at 21C. Certainly when I saw the 40C is wasn't 40C in the room. All fans are running, cleaned heat sink, fans and filters of dust.
I am guessing probably a mother board problem. What is interesting is that it only started happenning after I installed CentOS. Previously I was running Windows XP. Although there where a couple of strange problems with some game programs I attributed them to the game.
Sometimes I would get a strange noise on the speaker, like an old style bell phone ringing.
The system never just froze before.
Any more suggestions, other than replacing the motherboard of buying a new computer?
Ran memtest for 16 hours, no errors. Only cool air coming from fans.
Last edited by email@example.com; 06-15-2011 at 04:19 AM.
Reason: Test results added
Well, I have a Laptop now that is experiencing the same problem. It has been a dual boot system for quite some time running XP and CentOS 5.6 just fine. A few days ago I loaded VirtualBox. Now it does the same thing as the desktop I have loaded with the same software. Even exhibits the same behaviour of the CapsLock and NumLock lights flashing after it freezes. I find it hard to believe that both systems would have the same hardware problem, and/or exhibit the same behaviour consistently.