Answer Best answer as chosen by user glenvern1
The folder and question mark means
by mrmacfixit - 1/2/13 4:54 AM
In Reply to: Gray Screen by glenvern1
that your computer cannot find a valid System folder from which to boot.
I note that the "Apple man" has covered all the possibilities without coming up with an answer.
To answer your questions:
2. Not automatically, it will offer you a choice of installation locations and it is up to you to choose the external HD
3. No, except to say, when you have the OS installed on the external HD and the machine is running again, you need to get all your data, pictures/music/document/etc., off the hard drive if possible.
Or you could just use your backups to replace your data onto the external drive
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