[ubuntu] X server working on external monitor but not on laptop's

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http://ubuntuforums.org – Hello everyone I've recently bought a new laptop. It's an EliteBook 8440p. It has a nVidia NVS 3100 graphics card. I'm running the 64 bit version of Ubuntu 9.10. My problem is the X server will not display on the laptop's screen. The first thing I noticed, was usplash cycling trough different display modes while the screen repeatedly went black for a few seconds before showing me text again. After removing usplash, the screen just goes black and comes back at the login prompt (this is for the `nv' driver). At some point I could log in in "low graphics mode" (Hardware)