This seemed very unclear to me at first, until I tried to replace the cart tray. I apparently didn’t get the little lip under the mobo on my first attempt, and I noticed there was a pretty decent chunk of space between the front brass screw holes and their corresponding holes on the mobo. I reseated it, and the second time I heard a little click (apparently the lip going under the mobo). This time the bottom/brass screw holes were virtually FLUSH with the mobo holes. If you see a chunk of space between the cart tray and the mobo near the brass screw holes you didn’t get the lip under the mobo.
This seemed very unclear to me at first, until I tried to replace the cart tray. I apparently didn’t get the little lip under the mobo on my first attempt, and I noticed there was a pretty decent chunk of space between the front brass screw holes and their corresponding holes on the mobo. I reseated it, and the second time I heard a little click (apparently the lip going under the mobo). This time the bottom/brass screw holes were virtually FLUSH with the mobo holes. If you see a chunk of space between the cart tray and the mobo near the brass screw holes you didn’t get the lip under the mobo.