|Thanks for your replies .|
I have checked the yellow wire , there is no damaging to be seen on it.
I also tried to disconnect my floppydrive and then I turned on the pc.. but it did not work.
PSU = Power Supply Unit? just guessing .
I have tried 3 intotal , they all worked , but they were just loud , that why I changed them
After I first did not get any power , i did swap back to the original one , but it did not work .
I really think something has died .. but what? ._.