Can't get external monitor working on my ASUS N10J netbook

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http://askubuntu.com – I'm trying to use Ubuntu 12.04 LTS with my ASUS n10j netbook and it works fine other than the external monitor. I can use the monitor when running from the installation disk/pendrive but not now that ubuntu is actually installed,which leads me to suspect that I'm missing a driver. The display isn't detectable in settings and displays "no signal" whenever it's plugged into the netbook (but works fine with windows). Relevant things; ASUS N10J Intel Atom N270 @1.60GHz 2GB DDR2 RAM Graphics: NVIDIA GeForce 9300M GS Generic Sangyo VGA monitor Resolution 1024 x 768 (HowTos)