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Burned motherboard

Hi, I have a problem with my rig. I have 6x R9 390 mining ETH, I’m using esonic gladiator motherboard and it was all good, but today I wanted to clear all the cards, after cleaning I put 3 of them back to rig, and the motherboard burned (24 pin connector). What could went wrong and how can I prevent such a situations? Thanks in advance.

Check which wires burned, what they’re responsible for etc. are you using multiple power supplies?