I had the same issue recently, with corsairs newer closed loop system.. Needless to say it took my brand new MSI b150A mobo out, i was not as lucky as you, i could not find any dried spots, not untill the whole PC was apart with the motherboard on my lap. Bought a cheap air cooler and am getting 25c idle temps (much better then the water cooled) and better load temps on my i7 6700k @ 4.7 / 4.4. Safe to say im not going back to liquid anytime soon, thankfully it only took out my shitty overpirced motherboard which i wanted to replace anyway.
I would be assuming your motherboard is fried, and hoping nothing else, replace that cooler and motherboard, clean everything with iso, and go at it !