Intel Desktop Board 21 B6 E1 E2 Manual -

: Memory error. Try installing a single RAM stick in the first slot.

The front panel header controls your case's power button, reset button, and status LEDs. Connecting these incorrectly will prevent the computer from turning on. Intel boards typically use a standardized 9-pin or 10-pin block. Intel Desktop Board 21 B6 E1 E2 Manual