Re: Liquid metal cooling covering motherboard...
Your PC tech is right on the nose, gallium it is. Usually it is used instead of thermal paste by overclockers. I have never personally seen it used and would never recommend it for the exact reason you are now having problems.
Remember that it is metal, and if it already flowed onto the motherboard, the damage is done. A new motherboard would be the fix and hope it did not damage other components. Considering the cost, this is one of those life lessons. The previous owner should have told you but as always, Caveat Emptor.
Refurbished motherboard...$600-700 plus labour.
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