PC boot automatically

i installed 2 mother board in 2 different pc´s in. The pc´s are in different places.       
What happens is at the end of day, 2 pc´s are shutdown, the pc stop´s completely. But next day morning both pc´s are on. I try update bios, but the version available online is the same of this motherboard. I try change all hardware except cpu, but the problem is the same. In bios i try fail-safe option and best performance default´s but nothing.
rflorencioAsked:
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CallandorCommented:
You may have a Wake-On-LAN or other similar setting in the BIOS that is a trigger event to turn on the PC.  Turn them off if they are set.
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Mike TwistIT ManagerCommented:
What OS are you running?
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Mike TwistIT ManagerCommented:
Also many motherboards have a "power status after power loss" (or something similar) option.  In essence the thing turns itself back on if you've been subject to a power cut (or the office is powered down overnight).  It's worth while checking the power setting in your bios.
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rflorencioAuthor Commented:
Operating system is Xp, the lan cable is not connected to lan card (but bios don´t have  a Wake-On-LAN option ), and the power status after power loss is to stay off.
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Mike TwistIT ManagerCommented:
Are you using a wireless card, or are your systems not networked?

If they are networked are they on a Domain?
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CallandorCommented:
I would disconnect all the leads from the motherboard to the front panel and remove any USB devices at the end of the day and see if it continues to happen.
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rflorencioAuthor Commented:
     
I am not using a wireless card, but in this moment both pc´s have only windows and driver´s installed and not connected to lan(to test).
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