Just received my first antminer s9. Used from kaboom racks. Not off to a great start. Only one of the boards seem to be working. Reaching out to support now. https://nostpic.com/media/e3c2e0426eab0451f6413671b6103495a0501a9d2f1a60204a2116625234bd98/962f024184e94d41ceb5d7e3463bb4fef0d5edb0bd3f2b402457139018507321.webp 

 Looks like it's covered under warranty and they are shipping me replacement. Great customer support experience so far.