Optiplex 390 suddenly won't boot unless you is removed. Worked fine prior? - Dell Community
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Solved: 390 MT, Internal USB connector - Dell Community
OptiPlex 390 Small Form Factor Owner's Manual
System Board: Dell OptiPlex 760 Service Manual
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Dell Optiplex 390, is there supposed to be a heat sink there? Even one of these boards on eBay was selling used without one. What's the part number/where can I find it? :
OptiPlex 390 Small Form Factor Owner's Manual
Optiplex 390 0m5dcd Front Panel I/O Pinout (need help) - Cases and Mods - Linus Tech Tips