Power button does not flash

My miner used to work well two weeks ago before it showed relayed. I have fixed the relayed issue one week ago and then App show my miner syncing for several days and went offline until now. I tried rebooting the machine several time, but it did not work. yesterday, I found the blue power button did not flash as it was after reboot. Now I can’t pairing with the machine since it never went into pairing mod. Could you tell me what should I do ? Thank you.