Sources of power on the mainboard
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Where you can find which voltage and if it is a standby voltage or not can be found out here.(1.8V, 3.3V, 5V, 12V)
Here is the link.
All credits for this tutorial go to RDC.
Notice: The Tutorials have been done many times and were often successfull, however we cannot guarantee the success and so dont take any responsibility for any damages that might be caused by it, you do it on your own risk!!!