PC DIED WITH VIDEO CARD PLUGGED IN

Hello,
I've got a computer with theese characteristics:
PSU:700W
Video Card: MSI nvidia geforce 750 ti with 2 Gb DDR5
8Gb Ram
MB msi H77ma g43

I've replaced my old video card with this MSI nvidia geforce 750 ti with 2 Gb DDR5 and my computer doesn't wo...