Regarding the problem that the monitor output does not work after turning on the power of seeed studio (reComputer J4012)

Dear all

I have connected the HDMI cable and power cable for the reComputer J4012 mentioned in the title, but it does not output to the monitor.
The power light is glowing green and the fan is running.
By the way, it is brand new. This is the first time I have had this problem from a new unit, and I have tried changing the monitor and cables, but I can’t solve the problem.

If anyone has had a similar problem or knows how to solve it, I would appreciate an answer.

Thank you in advance.