Dell Mih61r Mb Front Panel Pinout -

| Pin | Signal | Pin | Signal | |-----|----------------|-----|----------------| | 1 | HDD_LED (+) | 2 | HDD_LED (-) | | 3 | PWR_SW (+) | 4 | PWR_SW (-) | | 5 | RESET_SW (+) | 6 | RESET_SW (-) | | 7 | PWR_LED (+) | 8 | PWR_LED (-) | | 9 | NC (or GND) | 10 | GND | | 11 | NC | 12 | NC | | 13 | AUD_MIC_IN | 14 | AUD_GND | | 15 | AUD_FPOUT_R | 16 | AUD_RET_R | | 17 | AUD_FPOUT_L | 18 | AUD_RET_L | | 19 | AUD_MIC_BIAS | 20 | AUD_GND |

Are you , or just troubleshooting a power-on issue? Dell OptiPlex 390 Desktop Owner's Manual

. Because Dell typically uses a single block connector for these connections, rewiring them for a standard aftermarket case requires specific pin mapping Front Panel Header Pinout (11-Pin)