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I just bought a Sony PCV-RZ56G. The problem I'm having is sometimes when I hit the power button to turn on the computer, it starts up but doesn't boot up. If I depress the F2 key at the same time, it will. I took it back to the place I got it and it worked fine for them. Brought it home and the same problem ensued. Is it my house wiring or something else? Help!

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