Late 2013 Macbook Air: I'm not exactly sure what's caused it but my keyboard has stopped working (except for the power button) and my screen has got some weird stuff going on too. I'm able to use the Macbook with an external keyboard mouse and monitor and would like to do a factory reset before I take it to Apple. Unfortunately, I can't seem to do CMD+R on boot. The windows button is acting as CMD (I can CMD+TAB between programs). Any other ideas? When I launch disk utility from a spotlight search, the erase option is greyed out.... Thankfully, I did a Time Machine backup a few days ago.