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The Dell MIH61R motherboard (often found in the OptiPlex 390 and Inspiron 620) uses a non-standard 34-pin front panel header, making it a bit tricky to case-swap into a standard ATX chassis. Unlike retail boards that use a simple 9-pin block, this proprietary Dell design integrates audio, USB, and status LEDs into one large connector. Header Layout & Pinout
- Functions reliably once correct pinout is known.
- HDD and Power LEDs work fine.
Cheat Sheet (Print This!)
Dell MIH61R Front Panel Header (10-pin, 2x5)
- Proprietary front panel (solved by this guide).
- Proprietary audio header.
- Often uses a non-standard 8-pin PSU connector (ensure your PSU has the correct Dell pinout).
- Front audio header (AAFP / HD_AUDIO)