New build only starts for 1 second (not faulty psu)


Just built a new pc and all wired up correctly and built correctly and I press the on button and it starts for 1 second then cuts out. It is definitely not the psu as I have tried an old 400w one and my new 600w corsair one and the same thing happens!

Any ideas as this is really frustrating me!
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More about build starts faulty
  1. You have confirmed that you are supplying power to the motherboard via the 24pin plug AND power to the CPU via the 8-pin plug?
  2. +1 for sadams04
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