Less rare than you might think. One of the Left for Dead games on the XBox (forget which and which) wouldn't display any LAN network connectivity unless a memor

Less rare than you might think. One of the Left for Dead games on the XBox (forget which and which) wouldn't display any LAN network connectivity unless a memory card was present. No memory card inserted? No UI difference between "No Ethernet plugged into XBox" and "XBox connected correctly to LAN". Insert memory card? Network magically appears. (I may have almost taken a sledgehammer to the hardware after I stumbling across this issue while setting up a PAX game room. And no, the memory card is not used for LAN play.)