There isn't one. Dell does not route a reset button to the front panel header on the MH61R. If you want a reset button, you must short two specific pins on the super I/O chip—which is not recommended for beginners. The "Dell Trap" Explained Why does your standard case power switch not work?
If you are reading this, you have likely just experienced a specific flavor of PC building frustration.
On a standard Intel motherboard, the power switch pins are usually and Pin 8 (Ground) . On the Dell MH61R, Pin 8 is NC (No Connection) .
