To be honest i got a little lost with your thread.
Just to confirm and some images that may help;
This is the ATX P4 4pin 12v cpu plug with yellow and back wires next to the ATX 20 pin power plug click here
The ATX 20pin + 4 pin shown is for the motherboard if it needs more power...depending on hardware.
Connecting this (+4) will do no harm as only power drawn will be used.