My rMBP 15" does not boot. Only white screen forever. I managed to run Internet Recovery (command+R at startup). It detects SSD, "SMART: OK" so I suppose that it's software fault. But if I click "Verify" it shows some weird errors and if I click "Recover" it sais that it can't recover, and suggests me to format. It does not mount the partition either (without any errors, just nothing happens if I click "mount"). The problem is I have an important info and I can't afford to lose it. I have good knowledge of computers and I want to try to boot from linux distribution and try to mount the partition to save my important info before format. I found some instructions but they are quite cryptic, it seems that booting Linux from USB on Macs isn't very easy. I'll try to do it anyway, but if there's any other way to recover my info, I would prefer that. I don't have USB CD Driver, so the only option to boot is from USB stick.