Hi guys, I'm in a right muddle. I was trying to boot camp. I followed all the instructions with boot camp assistant, then clicked install. My MacBook restarted and straight away a black windows screen comes up and says No bootable device -- insert boot disk and press any key. The USB I used to create the windows 7 bootable disk is inserted, pressing any key doesn't do anything. I can't even boot back to Mavericks. It's a retina MacBook Pro. I've tried holding shift on start up, does nothing. Tried holding option, does nothing. It's like my MacBook has been bricked. Anyone got any suggestions?