How to unlock a Mac

Hi everybody,
My stolen Mac has just been returned after being succesfully located in the cloud. The Mac was also locked with the Find my iPhone app.
My problem is that I find no way to unlock it because it doesn't find the start-up disk (questionmark when powered up).
Any suggestions other than doing a total re-install?
Thanks, Jos

(questionmark when powered up).
Jos...
Try holding down the Option key while starting up. That should prompt the Startup Manger window where you can select the startup disk then click Restart.
Other than that since you have Lion installed use Lion Recovery  (Command + R)

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