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For whatever reason, I have recently come into an early 2008 Macbook Air which has had its hard drive wiped completely, so there is no OS on there currently. How do I install OSX Lion or Windows 7/8 on it from a USB drive?

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You have to make a bootable USB drive. You can load a Windows Vista/7 ISO image onto a USB drive using Windows USB Loader. But for Mac, it's probably easiest just to buy a copy of Snow Leopard from the Apple Store and upgrade from there. (If the laptop is late 2008) you can also try to make a bootable Mountain Lion USB from a tutorial.

Then try booting the computer while holding down the Option key and you should be able to choose the USB drive from the boot menu.

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