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When I boot the computer , The screen still black and doesn’t show anything . I tried to change the VGA cable but nothing changed . It was working yesterday but today this problem occurred . Please help me . Thanks alot

Omar Ey, Samsung has issues with bad capacitors on the power supply. Disassemble your monitor and check for leaking, bulging or otherwise bad capacitors. I suggest to replace all of the caps, then retry. Hope this helps, good luck.