The monitor does not turn on, what could be?

Question

Iron

There is a computer with 2 monitors, recently one stopped turning on, in the evening I turn it off in the morning one does not turn on until you pull out the power a couple of times and some kind of buzzing (whistling) appeared, everything is fine on the second monitor philips monitors are the same

Answer 1

Why such questions?
Are you an electronics engineer? Certainly not.
Go to a repair shop))) or Avito
Sometimes it's easier/cheaper to buy a new one (used) than to repair an old one.

Answer 2

It does die though. Probably the electrolytes are dry.