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Resetting the EFI on a MAC
 
How to Reset the EFI on a MAC


The EFI (extensible firmware interface) is a set of instructions stored in the computers memory that act as an interface between the computer components and the operating system during startup.

Although it is mainly used in Intel-based Macintosh computers, other computer manufacturers are beginning to replace the older BIOS (Basic Input/Output System) firmware with EFI.

If you are having startup problems or your computer isn't working properly, you may be able to solve the problem by resetting the EFI to its default settings.

1. Shut down the computer.

2. Turn on the computer and immediately hold down the "Command," "Option," "P" and "R" keys at the same time.

3. Release the keys after you hear the computer beep twice.

4. Check to see if the computer is working.

If the computer doesn't start after doing all of the above then try this...

1. Reboot the computer and hold down the "Command," "Option," "O" and "F" keys at the same time during startup.

2. Wait until you see the message "To continue booting, type 'mac-boot' and press return." If the message does not appear, try starting the computer by holding down the power button continuously until the message appears.

3. Type "reset-nvram" and press "Return."

4. Type "reset-all" and press "Return."

 
Did you know that fragmented data can cause the read/write function of your hard drive to slow down. Set up a schedule to defragment your hard drive regularly. In Mac OS X, it is also helpful to verify and repair the disk and disk permissions.
 
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