Which video cable do you use? Is it connected to the GTX 760 and not the motherboard?
Which monitor is it?
Do you use adapters to connect to the monitor?
Is the power supply fan spinning if you press the power button?
8Pin ATX12V power connector to the left of the CPU plugged in?
Iin which slot did you plug in the RAM? Use the one next to the CPU.
GTX 760: Two 6Pin PCIe power connectors plugged in?
reset BIOS via jumper (have a look at the manual section clrCMOS)