My Hyundai monitor keeps going black

Hello

My Hyundai monitor goes black after 1-2 seconds. The problem is not in the computer. I tried it on a laptop, 2 computers and same problem. I also tried to change the monitor cable and still same thing.

More details of the problem occurring: I turn on the monitor. after 1-2 seconds the screen goes black. I tried to lower the brightness as someone suggested but still same problem.

1 more thing. If I don't run the monitor for let's say days. The first time I run it then, it works for 10-30 minutes before it goes black. Then everytime I turn it off and on again, it works for 1-2 seconds and goes black.

Please help me, and thank you very much in advance.