I noticed one of the fans in my Norco case wasn't spinning. I removed the fan and noticed that one of the pins on the fan mount was bent - so I stupidly took insulated tweezers and tried to correct the pin placement. There was a small spark and the computer restart immediately, I heard the power supply switch off and on and the motherboard light cycled. I pulled one of the hard drives immediately and out of the 24 it worked fine. Everything works perfectly right now, but did I damage anything? The fan was connected via 2pin molex and a SATA - molex adapter via a Corsair HX70 power supply.
It's fine, I've shorted molex connectors accidentally inserting them into older IDE hard drives. COULD HAVE something happened? Yes. Did it? Probably not, especially if it's running fine. It would have fried the PSU/mobo first/second. Since those are running, you're silver (instead of golden) ;-)
Look at it this way: now you know that the PSU's over-current protection appears to be working fine since it successfully prevented the PSU from either blowing itself up or blowing up something else.
A properly designed and working over-current protection should trip before the current has a chance to rise high enough to cause remotely significant damage tothe PSU. You would probably need to repeat the 'test' hundreds if not thousands of times to get a catastrophic failure of some sort.