I have a mini display port to VGA adapter connecting to a Vga monitor which works fine, but I also have a HDMI to VGA adapter connected to the same PC but for some reason the monitor stays on standby and doesn't load. If I connect the monitor that's staying on standby to the mini display port adapter and the other VGA to the HDMI, again the mini display port monitor works and the HDMI still doesn't. The mac detects that another monitor as been added and the model of the monitor, but button on monitor stays yellow in standby. I tried the adapter with another mac which also has a MDP > VGA adapter and it worked fine, seems to be something with my setup? Any ideas?