I have dual monitors and the second screen turns black and says D-Sub power saving mode. I have turned off all power saving modes on the screens and sleep timers on the computer. I have also tried other screens. i have recently upgraded from 400W to 600W pc power supply and am still having the same problem. Can anyone help me out. 4 month old computer really frustrating!!!
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Try a different signal cable to the affected monitor, and ensure monitor driver (just an information or INF file) from monitor maker is installed.
When the monitor driver is installed, monitor make & model appears in Device Manager. If it says “Generic” monitor, the driver hasn’t been installed.