I own an early 2008 white MacBook (4,1). System Information seems to show the MacBook runs 64-bit extensions, however, the graphics card is a GMA x3100. I tried following the same guide as DP1 to workaround the restrictions Apple has on compatibility for GM. When I try to load from the USB with the ML installer, I get a no entry sign. Does anyone else have this problem (or know another workaround?) This machine runs Lion fine... don't really get why it's no longer supported by Apple.