Btw, I'm using an iMac to connect. Blue light is glowing when I turn the e9 on. 

First time poster here so forgive me if this problem was addressed in another thread, I've searched and could not find anything.    I bought the Fiio e7 and e9 combo about a year and a half back, and a few months ago my computer stopped recognizing the combo when I connect via USB.   The e7...