I purchased and downloaded the Steam version of Defense Grid (DG) today, and spent some hours playing it on my desktop. No problem.
Trying to launch it on my laptop (an ASUS N10Jc with, 2Gb RAM, an nVidia 9300M GS graphics card and an overclocked N270 Atom running at 2.0 GHz in Windows 7), the screen appears to momentarily resize itself for a different resolution and then go black as though the game is starting - then I'm dumped back into Steam (if launching from the client) or the desktop (if using a desktop shortcut).
The system meets the advertised minimum specs, and I actually purchased the game with every intention of playing it on the notebook, so am pretty disappointed. I haven't encountered this problem with any other Steam game on this computer. Can anyone please offer some advice as to what may be causing this problem and how to resolve it?