After a while, that monitor developed problems of its own, so I put it away and tried the ASUS again.

I put it into storage and hauled out another (Acer) monitor to replace it. When I powered everything back up later, one of the monitors was dead. The problems began during a thunderstorm a few years back, during which I powered down the machine and then powered down the UPS serving it and the monitors. I have two ASUS VS247 monitors, purchased years ago (new), which I initially used in a dual-monitor setup. If nothing else, I might be able to short-cut troubleshooting for others with the same problem. If your computer is a Note Book you may need to change the Monitor Display proprieties by using the Switch Monitor Option which is generally a Key Combination like Alt F2 but this depends on the Make & Model of the NB.I realize this is a pretty old thread, but this is something I've encountered a number of times and in my case, the solution is pretty simple, albeit time-consuming. If you have a Crossfire Video Arrangement in this system you need to make sure that it’s correctly configured and that you are plugging the monitor into the right socket. It’s not easy to describe which Video Out Port to use but if you look at the back of the computer any Video Out sockets in the same area as the USB, PS2 or whatever ports there is a On Board which means part of the M’Board, the plug in Video Card is always located below the Sound Sockets. When you have a Plug in Video Card the On Board Video is disabled on most M’Boards so you get no picture on the screen. I have seen numerous customers move a computer and plug the Monitor into the On Board Video Out instead of the Plug In Video Card when they reconnect the Monitor. Is plugged into the Right Video Port out on the Computer.

How to repair asus vs247 monitor