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Leaving it on all the time, is usually better than turning it off/on too much, power surges contacts etc.

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it has nothing to do with power surges, it's mostly just the stress on the components (cpu, memory, motherboard) from warming up and then cooling back down (expansion and contraction of the metals and plastic).

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if anyone can confirm this, this guy should lose a star.

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He is correct. But power surges, well releasing/charging capacitors (which is what I meant), also wears on things, as stated above.