Download and install Apple Server Diagnostics version 3X106 from Apple Support Downloads.
Mac mini (Early 2009) with Mac OS X Server: Reinstalling Apple Server Diagnostics
Mac mini (Early 2009) with Mac OS X Server comes with Apple Server Diagnostics pre-installed on the hard drive. If you erase or repartition the drive and reinstall Mac OS X Server, the diagnostics will not be installed automatically.
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