Please HELP. Incorrect power plug coused bricked hardware on my sapphire RX 480 8gb

   There was 5 rx 480  graphic card pluged in (with 8 pin connector)  one Power supply that was turned on. I pluged (with 8pin connector) 6th card, without turned off Power supply. 5 Cards, that was alredy pluged, bricked after it. 6th card works fine.

  no one device 5 of these has any reaction, not spins cooling fans.

  what can i do?