Power Supply 24-pin won't clip to Motherboard

[Jlg823]

The 24-pin will slide in but it won't latch onto the motherboard. Do I need to apply more force or ???
I have the Corsair 750M and a Asrock H97M Pro 4

 

[SlayZombi]

First find out if there is a lip on the slot where something can actually lock on it. Tell me if you see that. Possibly post a pic.