A VGA to HDMI cable won't work unless your laptop specifically supports digital signal output through VGA (it doesn't, trust me).

You need a VGA to HDMI converter.  Something [like this](http://www.amazon.com/HDMI-VGACONVERTER-VGA-Audio-HDMI-Converter/dp/B0015YWV1G/ref=sr_1_1?s=electronics&amp;ie=UTF8&amp;qid=1324931826&amp;sr=1-1).  Not that exact one necessarily, I just put up the first result I got while searching.  I just wanted to give you an idea of what it is you're looking for.

Edit: Review of the cable you want from Amazon puts it better than I ever possibly could.

&gt;This cable is the equivalent of hooking a telephone wire to a water hose and expecting to make a call from your sprinkler.