It was indeed an Optiplex system. You can find reference to it in this KB article[1] about replacement system boards. [1] http://www.dell.com/support/article/b

It was indeed an Optiplex system. You can find reference to it in this KB article[1] about replacement system boards. [1] http://www.dell.com/support/article/be/nl/bebsdt1/sln145409/manageability-mode-options-on-replacement-system-boards-for-the-dell--optiplex--755---kb-article---327359?lang=en http://www.dell.com/support/article/be/nl/bebsdt1/sln145409/...