LB1 High Performance Battery for Apple MA897J/A MA897/A [2006 2007 2008] Macbook Pro 17 inch

If your Mac is acting up and you can’t figure out why, you might try resetting the NVRAM or the SMC. I’ll show you how. Modern Macs have a bit of NVRAM--the NV stands for “non-volatile”--and it stores information like your selected startup disk, speaker volume, screen resolution, and time zone. If you’re having startup problems, you might try resetting it. Here’s what you do. First, shut down your Mac. Then, turn it on and immediately press and HOLD DOWN, these keys: Option, Command, P, and R. You can let go after you hear the startup sound, and you’re good to go. Why P and R? Well, Macs used to have “parameter RAM” that was simliar to the NVRAM in modern macs. So they just kept the shortcut. NVRAM is not usually the cause of your problems. More often its the SMC, or System Management Controller That’s the part of your Mac that deals with power management, charging, fan control, keyboar