HT2711 MacBook Pro shows circle with diagonal line

MacBook Pro shows circle with diagonal line

It means it can't find the operating system.  And no MacBook Pro can run Mac OS X 10.3 or earlier.
The minimum operating system for any original MacBook Pro is some version of 10.4.4.  Some later ones can only run 10.10.
Please read
http://discussions.apple.com/docs/DOC-6413

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