Projects such as OSx86 have succeeded in allowing the Intel-based version of Mac OS X to run on non-Apple hardware largely by bypassing the TPM in software.
The "Trusted Platform Module," or TPM, is a computer chip embedded inside Intel-based Macs to prevent the Intel-based version of Mac OS X from running on non-Apple hardware. (during installation of Mac OS X, Mac OS X interfaces with the TPM. If Mac OS X finds that the TPM doesn't exist, Mac OS X refuses to install or run.) http://wiki.osx86project.org/wiki/in...un_Mac_OS_X.3F