Thank you Roger. That may very well be the problem. I hooked up the monitor in question and in doing so I noticed that the bottom screw could not be tightened up with the nut? I'm not sure what they're called. I will look at it again when I feel better. What has me more concerned at the moment is that my puter crashed after hooking up the old monitor. Since the old monitor in question kept blinking I could not tell much of what it was saying. I did see that Windows Vista would not come up. After hooking up my current monitor my puter checked for errors and then it asked me if I wanted to do a system restore. I wonder why my computer crashed when it was turned off when I hooked the old monitor up. I thought that monitors were plug and go?

Barbara