Monitor not get detected!

Feb 25, 2018
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i got my monitor from the repair yesterday it worked just fine. Next day when i turned the pc on it only showed the startup and after that it didnt get detected! just black screen. I plugged my hdmi to my old 19 inch monitor and it worked but idk why my new monitor isnt working. Please help!
 
Feb 25, 2018
20
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10


No bro, i took it to the repair because the led screen had a scratch. And i got it back yesterday i had guarantee so it was free :)
 
Feb 25, 2018
20
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10


I tried the same cable as i used before and it worked on it just fine but idk whats wrong mate. Any more ideas?