Due to the wrong hardware connection, the power cord is connected backward. Now tx2 cannot powered on successfully. Is there any maintenance service provided？
Hi it_xiaoqui, do you see any red LEDs on the devkit board when you apply power? Are you able to enter the TX2 into recovery mode and connect it to a host PC?
If not, then you may want to try to RMA it with the distributor that you originally purchased it from.