dell optiplex 755 turning on by itself

Dell / OPTIPLEX 755
November 30, 2011 at 12:09:16
Specs: Windows Vista, 2.66GHz / 3.5 Gb
I have a Dell optiplex 755. For the last 2 weeks it has turned itself on at 2:48am. I have gone into the bios and it was set to turn on so I would turn that off 3 days later it has done the same thing and the bios was set to turn the computer back on again. So I reinstalled my OS thinking I had a virus, well last night it done the same thing again so what is doing this?

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November 30, 2011 at 12:19:43
BIOS settings are not normally related to anything happening in the operating system.
Which part of the BIOS settings did you alter to stop it turning on?
Is it the "if power is interrupted" setting or is it the Wake-on **** setting?

Goin' Fishin' (Some day)

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December 1, 2011 at 00:32:30
The Wake on setting was what I turned off it was set to turn on at 2:48am and
I have turned it off twice now but some how every other day it gets set to turn on again at 2:48am

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