Why won't this build turn on?

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More about build turn
  1. Make sure that you have connected everything properly, the 4pin 12V on the motherboard, check that you have correctly installed the RAM. I would disconnect everything and connect only the main cable and the 4pin cable to the motherboard (disconnect all case fans) and see what happens.
    If the light in your PSU does not turn on it could be that the PSU is faulty. I would try changing the PSU so borrow it from a friend or if you have one lying around. It could also be the motherboards fault since your graphics card does not power up (re-install the graphics card) but as you described it i would put my money on the power supply.
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