I NEED HELP With my KG251Q P3 it blacked out

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i502
i502 Member Posts: 1 Newbie

i got this monitor 4 month ago from temu and today the monitor just blacked out

powered on plugged in all set when i turn on the pc just black screen no output,

it normally detect the monitor but no output, i plugged my second screen and it worked perfectly (2nd screen) when i went into the sittings i found it 2 monitors plugged in

i need help please, anyone who know this problem help please