I have a pair of 13 month old HP 2509m monitors connected to an HP 810-170st Windows 7 computer. Monitor Number 1, the main monitor, has developed a problem of going black. When I turn on the computer, everything boots up normally and when the login window appears on monitor #1 it lasts for about 2 seconds and then the screen goes black. I connected this monitor to another computer and the same thing happens. If I leave the monitor disconnected, monitor #2 becomes the main monitor by default and the login window appears there and everything works fine as a one monitor computer. What can I do to get monitor #1 working again? It seems like it must be some kind of settings problem but if it is connected it goes black and if it isn't connected whatever I do to settings using monitor #2 won't be seen by monitor #1.
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