ok i recently got this fan called thermaltake polo 735. I have everything installed just fine but when i try to clip it into the 478 configuration on my motherboard i have a problem. It has two clips one on each side you hook one side into it and then push down on the other side and its supposed to lock.. but i cannot figure out how to LOCKE it please somone help me! its just a standard 478 clip configuration.. it clips in on one end fine but i cant locke it!