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The current vintage of high speed processors comes on motherboards with "jumperless" configuration. You can diddle with the clock speeds and voltages to the CPU via software. If you set the voltage to a value higher than the CPU can tolerate, you could destroy it. A low level format of the hard disk before initiating the CPU destruction with overvoltage would pretty well torch the machine. At the minimum you would need to replace the CPU and reload all the data to your hard disk. A less damaging action might be to erase the FLASH BIOS on the motherboard. It doesn't take much code to do that.