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The computer is turned OFF via Shut Down,he stops
completly,but when I just touch the mouse he suddenly turns ON
and boots normaly.

Doesn't sound like shutdown but sleep [hybernate]. check your power/shutdown options
Here's wake on usb mouse from standby
http://support.microsoft.com/kb/280108

You have Wake on USB setup. To turn this off you have to go into you computers BIOS and find the setting. I can't tell you exactly how to do this because each BIOS is different. You will need to find the manual that came with your computer or call the OEM Tech support.

The troubled computer is a desktop,not a notebook. I think that a
desktop computer can`t go in hybernate or am I wrong?
He shuts down completly (start>turn off computer>turn off),
everything stops and shuts down,but just as I touch the mouse
he emediatly powers up,windows boots up normally just as any
computer would if you press the power button.P.S the mouse is connected via PS/2, not USB

I think that a desktop computer can`t go in hybernate or am I wrong?
I'm afraid you are. A desktop can be made to hibernate or go into standby just as easy as a laptop. Whatever it is you are going into some kind of standby mode.
Check Control Panel > Power Options and see what is set there. You will see there is also an option for hibernate.
Stuart

Hi,
Desktop PC's can Hibernate or go into Standby or be fully shut down.
The ACPI (Advanced Configuration & Power Interface) standard provides a standard for linking hardware, including the processor to the BIOS and to the Operating System. The ACPI standard ensures that hardware, BIOS and OS from different manufacturers have a common power management system. All standard PC BIOS chips conform to the ACPI standard.
Even if a PC is 'shut down', some components may still be powered, usually depending on settings in BIOS. The wake on LAN function is well known and allows a 'shut down' PC to be switched on by sending a particular message to the Network Interface Card.
In your case there is obviously a wake on Mouse enabled.
Other options include wake on Keyboard, wake on Time and wake on Modem. Implementation varies from motherboard to motherboard.
I would start in the BIOS and look at power settings.
Regards

A BIG "Thank You" to everyone for their input,it was a setting in
BIOS :-)
Thank You God for Computing.Net and it's users...

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