Full operation at the LHC was delayed for 14 months from its initial successful tests, on 10 September 2008, until mid-November 2009, following a magnet quench event nine days after its inaugural tests that damaged over 50 superconducting magnets and contaminated the vacuum system. The quench was traced to a faulty electrical connection and repairs took several months; electrical fault detection and rapid quench-handling systems were also upgraded.