I am using a MacAir computer, I connect an Ardunio UNO board, no problem. Upload programs and all is well. I remove UNO and install Littlebit module and NOTHING!. total failure. So I requested a replacement Littlebit module....it came...same problem. UNO works and same USB port Littlebit is dead. Yellow lites flash (yes I am using remote power 9 v and line adapter...both power up, yellow lites flash but LED module will not BLINK. Nothing loads to the Littlebit. Frustrating. Any help out there?