First of all I want to say thank you for the management. It's unexpected that I can install OS X on my old laptop.
Ok.. the problem is after I do an update from 10.9.4 to 10.9.5, and then it stuck at "Missing bluetooth controller". But it can be boot with "bootflag -f".
or, set kernel.plist file " KernelBooter_kexts = Yes " also works well...
This totally make me confused .. I've been replaced the mach_kernel of 10.9.5.
PLS help..Thanks..