[macvoiceover] booting from the internal drive

Good afternoon. I have a bootable firewire drive that I use and realize that 
holding x while booting will allow me to boot form it.  How do i boot from the 
internal drive without unplugging the firewire drive. Basicly I need a to force 
boot from the internal like the x that forces booting from the firewire drive. 
thanks.

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