First of all, I've installed Mavericks GM on Mid-2013 MBA and keep it up-to-date. Since Apple announced that Mavericks is free today. I decided to perform a clean install base on Mavericks GM. I tried this: 1. Reboot MBA then press cmd+R to get into recovery mode. 2. Choose Re-install OS. 3. Input my Apple ID and Password. It told me that "This Apple ID have not purchased OS X Mavericks", so I purchased Mavericks on another Mac and that worked. 4. "Downloading additional components..." for a while. 5. Automatically Reboot then "a folder icon with a question mark on it" keeps flashing. After some research it turns out that this might caused by "some problems during installation" or "hardware problem". So I chose to perform a Internet Recovery. 6. Shutdown and Power on then press option. Internet Recovery and Reboot. 7. Choose Re-install OS X "Mountain Lion". 8. Upgrade to Mavericks from Mountain Lion. At this point I thought there won't be any problem this time if I try to perform a clean install again. 9. Reboot MBA then press cmd+R to get into recovery mode. 10. Choose Re-install OS. 11. Input my Apple ID and Password. 12. Downloading additional components... for a while. 13. Automatically Reboot then "a folder icon with a question mark on it" keeps flashing, AGAIN!!! Is there any solution to figure this out? Thanks.