external monitor on alienware m17x

I have an Alienware m17x laptop running 64 bit Vista, and a Sony Bravia KDL-32M3000 LCD with both HDMI and VGA inputs. My previous laptop (running 32 bit Vista) only had a VGA connection, and using that, I could extend my desktop to the Sony as a second monitor. The m17x has both VGA and HDMI outputs, but I've tried both, and Windows actsl like it can't even see the monitor. I've checked the connections multiple times. Is there some other setting that has to be in place?
Thanks for any help you can provide.
Chuck
cwthornton1211Asked:
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jmarti80Commented:
You will need to change the output of your video.  Most laptops have a hotkey that does this.  For thinkpads it's the Function Key + F7  Look for something similar on your new laptop.
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cwthornton1211Author Commented:
Thanks for the guidance... turns out the hotkey is FN+F6 for my computer, but I'm still not there yet. The computer has a NVIDIA GeForce GTX 280M video adapter. The NVIDIA help file says I have to disable SLI, and then I should have three radio-buttoned choices of settings: "Save Power"; "Boost performance"; or "Mulitple Displays". So far, though, I can't get it to show me more than the first two choices. I've managed to put the desktop either up on the Sony LCD, or on my laptop monitor, but I can't get the system to recognize two simultaneous monitors. I'll keep working on it, but since the documentation says that, with SLI enabled, only a single display may be active at one time, I'm assuming that the key is that I haven't yet figured out how to disable the SLI. If someone else has struggled with this, I'm all ears.
Thanks,
Chuck
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cwthornton1211Author Commented:
Thanks for your input. I finally discovered some settings particular to the video card and was able to disable SLI and open up the 2nd monitor.
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