During boot process my desktop shows both Monitors, but after log I only get one.

I'm using Ubuntu 11.10

When I go into Displays its still only shows on Monitor.

Here is my graphics card details:

01:00.0 VGA compatible controller: nVidia Corporation G72 [GeForce 7300 LE] (rev a1) (prog-if 00 [VGA controller])
        Subsystem: Dell Device 0405
        Flags: bus master, fast devsel, latency 0, IRQ 16
        Memory at dd000000 (32-bit, non-prefetchable) [size=16M]
        Memory at c0000000 (64-bit, prefetchable) [size=256M]
        Memory at de000000 (64-bit, non-prefetchable) [size=16M]
        [virtual] Expansion ROM at dfe00000 [disabled] [size=128K]
        Capabilities: <access denied>
        Kernel driver in use: nvidia
        Kernel modules: nvidia_96, nvidia_173, nouveau, nvidiafb