. It is largely proprietary and often left unused when swapping cases
This is a classic symptom of a short on the Power SW pins. You probably have something metal touching pins 2 or 4, or you connected the Power LED to those pins by mistake. Unplug all wires and start over. dell mih61r mb front panel pinout
: The original Dell cases for this motherboard typically lacked a reset button. You can leave your new case’s reset switch disconnected or use it elsewhere, as there is no dedicated reset pin on this header. Unplug all wires and start over
The (Mission Hills/Sawgrass) motherboard is a standard microATX board found in Dell desktops like the Inspiron 620 Go to product viewer dialog for this item. and OptiPlex 3010 Go to product viewer dialog for this item. Dell OptiPlex 390 Desktop Owner's Manual
Are you , or just troubleshooting a power-on issue? Dell OptiPlex 390 Desktop Owner's Manual