NVRAM Reset Macbook Pro

The NVRAM Reset is a simple key combination that's performed at startup. The NVRAM is a special part of the system memory that your Mac uses to store particular hardware settings. The difference is simply that on Intel-based Macs, the special memory is referred to as NVRAM WIll fix No sound, Screen Resolution not Changing Correctly, External Display, Mac Takes a Long Time to Boot. http://astore.amazon.com/dt0dbe-20?_encoding=UTF8&node=9