Computer won't turn on when Graphic card it plugged in

Hi
I just got a GTX 560 ti and when i plugg it in to the motherboard the system won't turn on at all, but when i take it out it works. it works also when i just have the power cables plugged into the graphics card. Any idea what it is. Requires a 500watt PSU i have a 600 watt. Thanks.
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