I recently had my Acer nitro 5 AN515-55 repaired under warranty (motherboard replacement), when I got it back, I tried connecting it to my external monitor which had previously worked, but the computer is not detecting the monitor.
When I unplug the cord connecting the monitor to the computer from the computer, the monitor says Check Video Cable, when I plug it back in, it says No Input Signal.
So far, I've tried: Unplugging both ends for a minute and plugging them back in again, power-cycling the monitor , power cycling the computer, and updating my graphics drivers
Does anyone know how to fix this problem? or is it hardware related and the repairmen made a mistake?
[Edited the thread to add model name]