I have been working on this for 2 days now with 0 success. I have a first addition Macbook Air model A1237 that came with no hard drive due to it being donated from a college. I have no other working Macs to pull and image or backup from. I purchased a Zheino 128GB SSD and have successfully installed it into my macbookair. I tried to get a legitimate copy of the OS through the online Apple Store but in order to install it I haft to have a working Mac. So no success there..refund requested. I then got a copy of Mac OSX onto a thumb drive using TransMac. The version is 10.6.3. I went with an older version to escape any hardware issues I might encounter, from everything I have read this version should be fine. When booting up with any of these methods (option, c, command +option, command+ option +r) I can see the HD and the USB drive but when trying to install from the USB it tells me that the OSX can not be installed on this system. Then I have the option to restore from backup. From this location all sidebar options are grayed out. So no disc utility. I then can select restore from backup (even though I don't have 1) This allows me access into disk utility. I now can see both the USB and the HD. I have tried everything... starting with formatting the HD to extended journaled. Sending the bootable dmg file to the HD and mounting it. I tried with 1 partition, I tried with 2 partition making a 2nd one just for the bootable dmg file. I tried unmounted and mounted. I have set the partition scheme to GUID Partition Table, read/write status. I am stuck and need someone with exact experience with this issue to help me along. OH.. the nearest Apple Store is 100 miles from me..this for now is not an option.