My hp external display is not found

Have been using HP w19b as an external monitor for almost a year. I have a 2009 (late) 27" imac and am running 10.8.2. My external monitor went to sleep and never woke up on Nov 11, 2012. I don't think there were any new updates on this date. Had been on 10.8.2 for a while??? When I go to preferences, it is as though it is not even connected. I unplugged and re-plugged all connections. The monitor is not broken, just goes to sleep because it is getting no signal from imac. What in the world. Please help. I need the screen real estate!!!! The connection is the mini display port? to AVG adapter...

thanks for the reply...unfortunately, I just did all of the above. I checked all connections, no external monitor appears in system preferences - displays, did a restart in safe mode, did a SMC reset and a pram reset. Still no monitor. So I unhooked mine, and tried my son's monitor - an hp 2009m. I restarted my imac and the screen on the monitor said scanning for signal, no signal found, going to sleep.
Is it possible that the adapter thing to my vga cable has gone bad. Is there a way to see if the port itself is functioning?
I was on the verge of buying a bigger external monitor, but don't want to now since I am scared it won't work.
Is anyone else having this problem???

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My hp external display is not found

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