Check /etc/inittab and make sure that this line reads a 5 rather than a 3.
You can also try to manually start x windows to see what errors you get with
Finally, try to set up your video card and monitor with
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Ubuntu 8.04, Antec Sonata II case with 450-watt PS, AMD 64 X2 4600+ (65 watt), 4GB DDR2 800 RAM, 18X Lite-On DVD burner, Asus M2NPV-VM, Nvidia GeForce 7600GT (256MB), 320GB Western Digital SATA 3.0Gbps, Logitech MX-310, Dell 18" ultrasharp LCD, Microsoft Natural Ergonomic Keyboard 4000 and 2.1 Boston Acoustics sound system..