IMac external monitor not working after lion upgrade

Hi,
I have had an external monitor hooked up to my 09' imac for over a year now. I upgraded to Lion and ever since then it hasnt worked but one other random time when I moved and hooked everything back up. Im very tech savy, but this just doesnt make sense. Have combed google to find a solution. I have a Samsung 22in moniter and all the blue power button does is blinks at me. I am using a miniDisplay to DVI connection.
Does anyone have any suggestions other than resetting the ram?

I guess it's possible you've got some kind of hardware problem.... but not likley given it started with you installed your OS.
Here's a few things to try:
1. see if you can borrow another monitor just to be sure your monitor isn't the problem.
2. in System Prefs, and the Displays pane, click on the Detect Displays, then then the Gather Displays. If you get two diffenet display panes, that would lead me to think it's a monitor problem.
3. Lastly, disconnect your 2nd display, and restart. Then Shutdown, reconnect it, and see if that helps.
and of course..
4. make sure that all of your connections and adaptors are tight.

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