Why won't MacBook boot from external drive?
I cloned my internal disk to an external drive so that I can upgrade without recovery disks. Formatting is right, size is fine, disk utility says the new volume is bootable, and it appears as a bootable volume in system preferences. When I reboot and hold option, though, nada. Just the internal disk. Strangely it works perfectly on my girlfriend's 2009 macbook 5,1. Only difference is she has a faster processor and bigger hd. Have tried firewire 400 and usb 2.0 with no luck. Any help is greatly appreciated!
It's a 1.83GHz OSX 10.5.8.
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