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I have a Debian Squeeze system with an AMD64 processor.
When I try copy over 1 GB, the computer dies (no reboot, completely down), and the logs don't contain anything useful.

The temperature of the processor is ~42º.

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could you please give details of your copying command/operation. – sybreon May 9 '12 at 3:36
Do you have swap disabled? – invert May 9 '12 at 8:11

How much RAM do you have?

You might be doing something that is causing the machine to either hit some bad RAM or hit a out-of-memory error.

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Booting to memtest is the first thing I'd do. – 9000 May 10 '12 at 17:39

I change the power supply of 450 to 600

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