>Hi Sergey,
>
>The issue showed up a relatively short time after I bought the machine. Took it back to them and they set it up and watched it and nothing happened ( naturally - customer support in the computer hardware industry just stinks :-( ). The problem was very intermittent and not often. But in recent days/weeks it has increased in frequency to be problematic. Fans are all running and I cleaned the various parts/ports of any accumulated dust. Is there a setting that can be checked to see if the motherboard has overheating protection?
>
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>>Did you have this problem from the beginnig or it started later? Does motherboard provide protection from CPU overheating? Did you check CPU heatsink and fan?

Do you use an UPS?