Purchased 6 months ago from Double Dex. It worked great at first and my daughter was excited to head to college with her new MacBook.At about 5 months, the AC adapter stopped working (the part that plugs into the wall broke. No one local sold just that part so she had to wait a few days for one ordered online to arrive).Now, at just under 6 months, the MacBook crashed and no longer turns on. We watched a bunch of YouTube videos with different ways to reset it or try to get it to power up but nothing works. The AC adapter shows power but the computer does nothing; no beep, no fan, nothing...