Boot process hangs if external firewire drive disconnected.

I have an external firewire drive connected to my desktop at work. Time machine has been working well until someone disconnected the firewire drive. I didn't notice that it wasn't connected, but what I did notice was that the computer would hang at the grey screen during the boot process. Sometimes, I shut down the machine and then started it again, it would boot normally.
Then I noticed that the firewire drive was disconnected. Once I reconnected it, there were no longer any problems. I haven't seen any posts about this topic but I have heard from other folks at work that they have had the same experience.
So my real question is this: if I set up my MacBook Pro (which I carry back and forth to work on a daily basis) to have Time Machine back up to the Time Capsule at home, will the MacBook Pro be reluctant to boot when I'm not at home and Time Capsule is not available?

Has no problem booting when disconnected from time machine

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