Do not trust the color of the wires on a Dell OEM case. Dell changes wire colors between revisions. You must go by pin position, not wire color. The Actual MH61R Pinout (Verified) Here is the pinout looking at the motherboard header with the PCIe slots facing down (bottom edge of the board towards you).
On the Dell MH61R, the power switch circuit is on and Pin 7 (GND) . Dell Mih61r Mb Front Panel Pinout
If you are reading this, you have likely just experienced a specific flavor of PC building frustration. Do not trust the color of the wires on a Dell OEM case
Let's tear down the schematic, identify the pins, and get your machine booting. On most standard motherboards (Asus, MSI, Gigabyte), the front panel header is a block of 9 pins (missing one for keying). Dell, however, uses a 10-pin or 12-pin header layout that redefines everything. The Actual MH61R Pinout (Verified) Here is the
On the MH61R, look for a header labeled or simply FRONT PANEL . It is located near the bottom right edge of the board, usually just above the SATA ports.
Welcome to the world of Dell proprietary pinouts. The MH61R does not follow the Intel standard. At all.