Macbook Pro won't boot with external HDD plugged

I have a weird problem. My late 2008 Macbook Pro won't start with external HDD plugged either FW or USB... The screen stays white until I unplug it and then the Apple logo is there.
Anyone know any solution for this? Or anyone have the same problem

yeah I had the exact same issue with one of my 750GB externals too. I just left it for a while (about an hour or so) and it was fine..
I believe its so slow because the system is indexing the drive, which can be a very slow process if the drive is big, has a complex folder-hierarchy, and/or is fragmented.
Does the hard-drive appear quite quickly in Finder once OS X has started up? if its slow it may confirm what I've just said.

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