I know this sounds stupid.... have you tried unplugging/re-plugging the monitor?
I have a syncmaster and have been running 2 computers to it for the last week(doing some repairs on mil's). 1 is vga, the other is dvi. I have to remove power from it for it to recognize the signal when I switch between the 2.
I have a syncmaster and have been running 2 computers to it for the last week(doing some repairs on mil's). 1 is vga, the other is dvi. I have to remove power from it for it to recognize the signal when I switch between the 2.