[all variants] do you know what is wrong with my pc?

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http://ubuntuforums.org – when i turned on my pc my power supply made a weird scratchy noise (im pretty sure it was the power supply). so i got a new power supply and when i try to turn on my pc nothing happens. i dont think it is the motherboard or graphics car because the light on my motherboard turns on and i tried turning my pc on with and without the graphics card, im about to try it without the hard drive but does anyone know what my problem could be. also the new power supply works as i tried it on an old pc as well. (Hardware)