Install OSX from an External Drive

hey folks!

i'm working on friend's mbp, screwed osx installation , needs reinstalled (as far can tell!)

found these tutorials:

http://osxdaily.com/2009/09/02/inst...or-how-to-upgrade-to-106-without-a-dvd-drive/

http://www.youtube.com/watch?v=rczu23c8a78

when section:

"*next, click “restore” tab within disk utility
* select newly made snow leopard 10.6 install dvd image , restore image guid partition created or…
* alternatively, can select snow leopard install dvd , restore directly dvd guid partition"

i'm unable second of these options, , when try first, message: "restore failure. not find scan information. source image needs imagescanned before can restored."

have no idea means, nor turn here...

thoughts/ideas appreciated!

in advance!

 

does mean, have dmg file want reinstall mac os x?
mount dmg file in regular mac os x environment, open carboncopycloner , clone external hdd formatted properly*. how did , haven't had problem yet, though method linked might same.

*

how format new hdd/ssd install mac os x or make bootable copy onto​

 

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