[RMA] no output on HDMI and a light on red LED

After 2~3 days normal power on, I found I can't connect to LP remotely. I long pressed power button to power off then power on. Blue LED flashes and red LED is on forever. Several seconds later, blue LED turns off. No HDMI output.

I tried hard reset but is not helpful. I have no CN2. My board is 2GB RAM/32GB eMMC.