This post is a bit old and it looks like the motherboard is okay and the capacitor is okay too.
Those capacitors, even if they did go bad, they shouldn't give you bad results the moment you start torturing them.
As Lotus said, that dent might have changed the capacitance slightly.
I'm not sure what that capacitor is used for, but probably for voltage stabilization. If so, even if the capacitance changed, they won't be much of a problem and you won't notice a thing.
I just googled your motherboard and it looks like that capacitor is a solid capacitor, not an electrolytic capacitor.
If you've dented an electrolytic capacitor, that's a bad thing, since they explode and put off fumes or leak and release the electrolytic liquid inside them when they are too old or take in voltages higher than their specs, and denting will decrease its lifespan. But since your capacitor looks okay, nothing to worry about.