I've had both of the two working for months now but now the moniter isnt recieving any input from the desktop.
Ive tried a few basic things to fix it but nothing has worked.
The only hint as to why it stopped working was the fact that the day before it stopped working my little brother pressed the change input button on the bottom and switched the input it was taking but I switched it back and it's now not working.
Also, are you able to see anything with the built in self test, or is it always black?
You can try unplugging the monitor, resetting it to factory default, and then plugging it into a different video port.