解决VirtualBox安装Mac OS X El Capitan开机卡住问题
在配置完新虚拟机后关闭VirtualBox，用管理员权限启动CMD，转到VirtualBox安装目录，依次运行下列指令：
VBoxManage modifyvm "Mac虚拟机名称" --cpuidset 00000001 000106e5 00100800 0098e3fd bfebfbff
VBoxManage setextradata "Mac虚拟机名称" "VBoxInternal/Devices/efi/0/Config/DmiSystemProduct" "iMac11,3"
VBoxManage setextradata "Mac虚拟机名称" "VBoxInternal/Devices/efi/0/Config/DmiSystemVersion" "1.0"
VBoxManage setextradata "Mac虚拟机名称" "VBoxInternal/Devices/efi/0/Config/DmiBoardProduct" "Iloveapple"
VBoxManage setextradata "Mac虚拟机名称" "VBoxInternal/Devices/smc/0/Config/DeviceKey" "ourhardworkbythesewordsguardedpleasedontsteal(c)AppleComputerInc"
VBoxManage setextradata "Mac虚拟机名称" "VBoxInternal/Devices/smc/0/Config/GetKeyFromRealSMC" 1