There are 2 issues I have had with the BTC-T37 that I have found good fixes for. The first is that it doesn’t always boot and the second is that it initially struggled to find cards. What I found is that if you power the main board input with a 500 W, 20-pin power supply, and power the cards separately with an external power supply (1,200 W or 2,400 W), then the best way to start the board is to turn on the external power supply first and then turn on the 500 W power supply. It’s like the board thinks there are no cards if you do it the other way. Second, if you are using AMD cards, use NBminer. I have tried others but for some reason NBminer seems to run the best. And don’t mix AMD and NVidia unless you like rebooting your rig a lot. Also, I find prefer running the BTC-S37. Spacing is better and you don’t need a separate 20-pin power supply.