Mac Not Starting Up When Ethernet Connection Removed

Hi
I took my mac away from home and as of yet don't have any type of internet connection. I was hoping to still use it for itunes, photos, etc. until my cabel internet is up and running.
However, I powered it up without the Ethernet connection and it didn't seem to boot up. I just got the gray screen with one of those cirlces with a line through it (think Ghostbusters) and it didn't seem to boot up.
I am going to try it again tonight but was wondering if anyone had similar experiences. ??
Thanks!

Your Mac appears to have forgotten the location of its boot volume. Restart the Mac while pressing and holding the "Option" key. This should then give you the option of selecting the boot volume.
After the Mac has started and has opened your account, go to System Preferences > Startup disk from the Apple menu and select your boot volume to reset it as the Startup disk.

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