How to fix Black screen pc monitor?

[Ais Mata]

Hi i have a pc issue, i dont know if it is both the screen and the computer or just the screen, but immediately after i turn on the monitor after one second the screen blacks out, its the same when i disconnect and reconnect the vga cords, or when i turn on and off the screen, or even if i turn off the pc the screen turns on for one second to show that its disconnected and turns off, i tried win+ctrl+shift+b it has the same result, turns on for a second and blacks out after that and nothing its like the black screen of death.

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