The operating system does not work

my friend has white mackook pro, the operating system does not work. When i click the power button, it starts booting but it never open the the welcome window. How i can solve that problem?  i do not have cd from mac OS. thank you.

If you do not have an install dvd youll have to take it to an iStore ...
(I doubt he has lion, so the recovery partition doesnt exist)

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