Is antitheft system problem? Car wont start after 2 hr prior start

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Clicking noise when turning ignition key. Did not turn over. Anti theft light in dash flashed then stopped. Faint clicking noise persisted even after key removal. Interior lights still came on. Now no power to anything. tried the key code reset sequence- 8 turns of key from off to on within 10 sec. Leave key in on position until door locks click. This never happened with either programmed key.