Every Intel DH61-class board (which 21b6e1e2 belongs to) has known flaws. The manual offers no solutions.
If your board is a DH61BE, DH61WW, or DH61CR, you are in luck. Use Intel’s official (archived) support site: intel desktop board 21b6e1e2 manual better
The most intimidating part of any motherboard installation is the F_PANEL header—the cluster of pins that controls your power switch, reset switch, and LED indicators. On the 21B6E1E2 board, these pins are often tightly packed and unlabelled on the PCB itself. Every Intel DH61-class board (which 21b6e1e2 belongs to)
This is where the manual becomes your best friend. Do not try to guess the polarity of the LEDs. Using the manual here ensures you don't short
Using the manual here ensures you don't short out your board by bridging the wrong pins. A "better" usage involves taking a photo of the manual page on your phone and zooming in on the pin layout so you can see exactly where your tweezers need to place those tiny connectors.
The official manual only lists compatible CPUs up to 65W TDP. That is overly conservative.