Mac mini no longer connects to external monitor

I had my mac mini connected to a LG HDTV and it worked great up until recently. When I know go to the external connection it says "signal not found". I then tried to connect it to the monitor on my desktop and that doesn't work either. I'm guessing then that it's a video card issue, however, when I tried screen sharing through the network I could not find the mac mini on the network either. If anyone has any suggestions of how to proceed, I'd greatly appreciate.
Much thanks!

Thanks for the suggestion - I have thought about it. However, it shouldn't be this difficult. For some reason, the Mini does not see the AEBSn by ethernet and I have no idea how to force it to do so. I've rebooted the computer twice, but to no avail. If I turn on its Airport, it connects to my AEBSn wirelessly. But this computer streams 720 content to my Apple TV and I need that ethernet connection to work for satisfactory streaming.

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This question was solved.
View Solution.

Hi,
All Dell monitors come with CD's for drivers. Your laptop may not know the monitor w/o its driver, it won't install automatically. Please check:
Ringht click a blank space on desktop,
Click Personalize
Click Display
Click Change display settings
Can you see BOTH laptop screen and external monitor in there as shown on the following image:
For testing, I put my Dell monitor is my main display. If I can't see 2 monitor, you need its driver first and then check the cable.
Regards.
BH
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