Before you go buy a new Mobo, rob a power supply from another PC if you have one and try using that first. About a year ago i had the same thing. The pc powered on, fans came on, hd was spinning, the little mobo light was on etc but nothing came up on screen and it never booted windows. Turns out the PS was knocked about cause i swapped it over before getting a new mobo and it came back to life.
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