Ib250mh Motherboard Manual ~upd~
The manual shows two USB headers: F_USB1 (9-pin) and F_USB2 (9-pin). Ensure your case cable is aligned with the missing pin (pin 9). Rotating the cable 180° will short the board.
The Hidden Workhorse: Decoding the Lenovo IB250MH Go to product viewer dialog for this item. Motherboard ib250mh motherboard manual