I have not successfully updated to 10.11.2 yet. Reboot with USB, install MultiBeast (Legacy mode, Network - AppleIntelE1000e), install VoodooHDA2.8.8 Installer, install NullCPUPowerManagement.kext with KextBeast (installing this allows you to enable CPU EIST) Reboot with USB with -v -s, remove AppleIntelSNB* againġ3.

Copy MulitBeast, VoodooHDA2.8.8 Installer, KextBeast, and NullCPUPowerManagement.kext to USB to save timeġ2.

Remove AppleIntelSNB* from the newly created USB (you can do this by following the steps you used before or simply open in Finder, navigate to folder and drag file to Trash (the actual file has a longer name))ġ0. Create USB El Capitan installer using UniBeast (make sure time settings are correct)ĩ. Snow Leopard should be running normally with audio and internet!Ĩ. Reboot (without iBoot) with boot commands -v -s and remove AppleIntelSNB* by using these steps in the terminal prompt:į. Install 10.6.8 update, Install VoodooHDA2.8.8 Installer (you can skip this if you are going straight to El Capitan use the installer instead of MultiBeast because it also installs the AppleHDADisabler.kext), Install MultiBeast (easyDSDT, System Utilities, Network - AppleIntelE1000e)Ħ. Install UpdateHelper, reboot using iBootĥ. Install Snow Leopard, reboot using iBoot (you NO longer need to use command GraphicsEnabler=No)Ĥ. Boot with iBoot, switch to Snow Leopard Install DVD, boot using command GraphicsEnabler=Noģ. Set BIOS to ACHI mode and disable CPU EIST (Enhanced Intel SpeedStep Technology (this is only necessary for El Capitan install))Ģ. These are the essential components in my Dell OptiPlex 990:ġ. You should have read those a few times and have a good general understanding about the steps required before using this guide. These instructions are based on the 10.6 and 10.11 guides posted on this site.

Dell optiplex 990 bios bin