Joined inYosemite beta seed 计划after that，Routing the first time to upgrade it，After upgrading to want to open at hand cheaptrim，Okay, I admit that in fact is not turned on and basically not much difference between the actual feelings on，Forgive my obsessive-compulsive disorder。
Open accordanceThis postDried，Very smooth process，The results were tragic
Restart the progress bar and hung up halfway，Display aWhite prohibit icon，Even thecmd+sSuchSingle-user modeCan not enter the，The same white prohibit icon。I do not know the previous version, such as the Mavericks will likewise，But I think it should be that before they say
CommonWhite Apple + unlimited daisyThe。
In short，Also I do not want to look for a computer to make a boot disk and then reinstall the system and then restore the data (Look at this sentence is not some dizziness，In fact, if I do it will be more dizzy。）
SolutionYes，You upgradeYosemiteafter that，In fact, you probably can not see at boot timerecovery HD，But that's okay，You could try usingcmd+rComeNetworking downloadA temporaryrecovery HD，Then by utility，Enter the terminal。(Provided that the network quality is better，Probably have to wait several minutes to several hours ranging from it ......)
Enter the following in Terminal them
rm -rf /Volumes/你的系统盘/System/Library/Extensions/IOAHCIFamily.kext
cp -r /System/Library/Extensions/IOAHCIFamily.kext /Volumes/YourDisk/System/Library/Extensions/IOAHCIFamily.kext
kextcache -u /Volumes/你的系统盘
Remember progressive input ah，I hope you have someUnix-like operating systemThe experience ......
In short，You may encounter difficulties in the last command，After you complete input，The system will prompt you
Lock acquired; proceeding.
At this moment，onwait a moment，Then execute this statement (last command)，Until it is no longer on top of that sentence prompted the，Is OK，Then reboot your system!
Reproduced Please keep the source and description link：https://www.logcg.com/archives/624.html