what was it that leaked? - i.e. non-conductive coolant, water, distilled water? also how old was the coolant since you added it to the loop (if you only top-up your loop then how old is the oldest stuff in the loop?)
I had non-conductive coolant completely cover my 4870x2 while running a game benchmark and shut the pc down. I failed to see the leak and tried booting the machine 4 or 5 more times before i spotted it and unplugged everything - 1hr 25 mins, lots of paper towel and a hairdryer later the machine was back up and running no probs, so hopefully you'll be ok
(my coolant was only 2 months old, so it hadn't had time to ionise and become conductive again)