If after powering on the mining machine the LEDs on the front do not light up after 1 minute, there could be several reasons causing the issue.
Micro SD Card or card reader:
Check the controller board for a blinking blue LED. If there is none, re-image the micro SD card or use a different one. If there is still no blinking blue LED, the card reader on the controller board may be damaged.
Bad LED board:
Try to log into the miner and check the mining status. If all seems normal, check the data cable to the LED board if it is connected properly and securely. If the LED lights still do not work, the LED board needs to be replaced.