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Computer turning off and on, on its own....

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Many folks use a wireless mouse, keyboard, printer etal, which operate on infrared light (IR)

Is it possible that the IR sense is detecting a normal level of IR light, which is interrupted by your passage by the thing? Do you have wireless stuff on it, or are you using wireless connection? Many, many, many devices* operate on 900 mHz and 2.4 gHz these days (routers and more).... perhaps you're interrupting a constant signal on one of these bands, that's coming from a device in your home, or somebody else's (the condominium).

*Routers, cordless phones, remote control ANYTHING, garage door triggers, etc... Even an un-used wireless keyboard that's stored in a closet with the batteries still inside.