Depending on where the bend is, it should be repairable without too much hassle. There are a number of ways to do it, but I've had good success using a pair of tweezers and needle-nose pliers. (Try with just the tweezers first.) The key is to minimize the stress at the base of the pin so it doesn't snap off. Also, make sure that the power cables are disconnected and press and hold the power button a while to make sure there's no power in the board.
If the bend is at the base of the pin, brace one tip of the tweezers on the backside of the bend, braced against the base of the pin and the mobo. You'll hold this in place, while you slowly and as gently as possible, press the other tip against the inside angle of the bend until it's straight. Doesn't have to be perfectly straight, just straight enough to mate with the female connect sleeve.
If the bend is higher up, use the pliers or tweezers, whichever fits better, to brace the base of the pin, so that when you apply pressure farther up the pin, the base remains locked in place. Then use the same technique as I described above with your other tool.