ASUS P8Z77-M LGA 1155 Intel Z77 HDMI SATA 6Gb/s USB 3.0 Micro ATX Intel Motherboard
CORSAIR Enthusiast Series TX750 V2 750W ATX12V v2.31/ EPS12V v2.92 80 PLUS BRONZE Certified Active PFC High Performance Power Supply
560 Ti Geforce
Intel Core i5-3570K Ivy Bridge 3.4GHz
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I would pull out the video card and try the onboard video first. You may the wrong power supply lead connected to it or on the board. Did you connect the 12v (4 or 8) pin connector next to the cpu socket?
is the 4 pin AND 24 pin connected to the mobo? sounds like a common case of missing plug.