How to restore from hard drive that won't boot?

My Macbook Pro recently started hanging at the grey boot screen, and the hard drive was replaced under Applecare. I've got the old hard drive in a USB enclosure now, and everything on it seems to be readable despite it refusing to boot from this hard drive. Disk utility reports no problems. Is there a way to restore the files and applications from the old hard drive onto the new hard drive? I presume I can't just make a new time machine backup from the old hard drive and restore that?
Thanks

Try the migration assistant:
http://support.apple.com/kb/HT4413
If that doesn't work, you'll have to use a data recovery tool:
https://discussions.apple.com/docs/DOC-1689

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