It's not clear from your post, but the "contacts" may be header pins on the motherboard, if attached at all it's unlikely it's damaged enough to not work. But the power LED lead is polarized so if it's not working just flip it around to see if it does.
If you bent the pin back in position, there should be no problem.
Perhaps the front panel lead has an issue, or the polarity is off.
Try connecting the pwr led to the hdd led to see if you get lights during hdd activity.
LED's are not essential to operation so you could do without.