As you may have heard, OS X 10.6.2 kills Atom powered netbooks dead. It's not clear whether this was an intentional move by Apple to keep people from installing the operating system on netboks, or if it's just a side effect of the fact that Apple has absolutely no reason to support the Atom chipset since the company doesn't have a single product using the Atom processor.
If you were one of the folks that decided to try upgrading your hackintosh netbook from OS X 10.6.1 to 10.6.2 anyway, you've probably noticed that your computer now gets stuck in a feedback loop when you try to boot it. But don't worry. There is a way out of this mess. Basically, you can roll back the kernel to the 10.6.1 kernel and keep many of the other updates featured in OS X 10.6.2 by following a series of steps posted at the MyDellMini forum.
If you haven't upgraded yet, you might just want to wait a few weeks instead of trying to do a partial (non-kernel) upgrade, since the developer of the NetbookInstaller application that makes loading OS X onto netbooks easier says that he expects a kernel fix in a few weeks that will allow patient OS X netbook enthusiasts to move forward with the latest version of OS X Snow Leopard.
Post from: Liliputing
How to recover a hackintosh netbook killed by OS X 10.6.2 upgrade