New build not booting

i have just built my own pc:
Mobo GA-Z77-D3H
Processor Intel i5 3570k 3.4GHz LGA1155
PSU Powercool 750w modular

When I power on the PC, the case LEDs just blink and nothing else, like the power only goes through for a split second. During this time the CPU Fan (Stock intel) obviously tries to spin but the power doesnt last long enough. I have taken out the ram and nothing, Ive unplugged everything except the motherboard from the PSU and nothing.
Please help, everything is brand new and I spent around £500 on all of this.
4 answers Last reply
More about build booting
  1. No beep codes or anything, as I say I have tried removing different parts including RAM but to no avail
  2. Doing that now...... *** i forgot standoffs will do and reply thanks
  3. done it thanks so much im so stupid i cant belive that
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