brick-Touch Sensor powering a computer motherboard

can It be possible ? i mean , its functions are the same , send a signal to something ,

From here

To here

Yes.
If the connectors supply 5V, GND and can handle 5V inputs.

But i think without debouncing your motherboard will be not amused…

it can provide 5V and ground , what u mean about , debouncing ?

arduino.cc/it/Tutorial/Debounce

You must make sure the switch input get only one HIGH impulse if you touch the sensor.

Take a look at the picture:
micahcarrick.com/avr-tutoria … ounce.html