BIOS/CMOS Settings

From Rebel EFI Wiki

If when booting OS X your computer hangs at a screen with the Apple logo and a "no smoking" sign, you may have an issue with a BIOS Setting. To rectify this, follow these procedures

Be sure to have both the most recent BIOS downloaded and installed from the manufacturer as well as the most current version of Rebel.

General BIOS settings

Generally speaking your BIOS must be set to the following options to ensure maximum compatibility

**Note: Power down the machine after making changes to the BIOS**
1. If AHCI, SATA, or RAID controllers are avialble, set them to enabled
2. If Speed Step is present, set to disabled
3. If EIST is present, set to disabled
4. HPET set to 64-Bit Mode
5. If you have an IDE controller, set to disabled

Award BIOS settings

When working with a Gigabyte Motherboard, be sure to use the following settings.

1. Boot the computer into the BIOS settings. 
   **Note:: keystrokes vary by manufacturer**
2. Under the Advanced BIOS Features menu, set:
         o HDD S.M.A.R.T. Capability [Enabled]
         o CPU Enhanced Halt [Disabled]
         o CPU Thermal Monitor [Disabled]
         o CPU EIST Function [Disabled]
3. Under the Integrated Peripherals menu, set:
         o USB Keyboard Function [Enabled]
         o USB Mouse Function [Enabled]
         o SATA RAID/AHCI Mode [AHCI]
         o Onboard SATA/IDE Device [AHCI]
4. Under the Power Management Setup menu, set:
         o HPET Mode [64-bit Mode]
5. Save changes.
6. Exit BIOS Settings.