Not booting with external drive attached after itunes 10 installed.

Since installing itunes 10, my computer will NOT boot into Mac OS X with the external drive attached. It consistently freezes at a grey screen with the apple logo.
If the external drive is powered off, it will boot normally - but slowly. Anyone else with this glitch?

AndyPeardrop wrote:
if I forget to UNPLUG the Lacie (by pulling out the Firewire cable), when I boot the Macbook it will give me the Question Mark.
Try opening the Startup Disk panel of System Preferences and redeclaring the startup disk. You could see this behavior if your Mac isn't sure what device to use for booting.

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