restore original os on apple macbook pro a1286

On the laptop keyboard, press and hold the following keys, this sometimes causes the Mac to turn on:.On the latest model Mac laptops with security chips, Touch ID, and Touch Bar, resetting the SMC is performed as follows: How to Reset SMC on Newer T2 MacBook Air, MacBook Pro with Touch Bar Do notice that the System Management Controller reset instructions are different for some Macs, including MacBook and MacBook Pro’s if the machine has a T2 security chip, as well as an internal battery versus a detachable battery, and additionally the procedure is different for some newer desktop Macs than older ones, and different than Mac laptops. If those type of issues describe the problem encountered on the Mac and you have concluded that you need to reset your SMC, we will show you how to do it on any MacBook, MacBook Pro, MacBook Pro with Retina display, iMac, Mac Mini, and Mac Pro.

* General performance and functionality problems: abnormally sluggish behavior despite no CPU or disk usage, external ports not working, airport & bluetooth aren’t showing up, external devices are not being found, etc * Video and external displays not working: display brightness functionality not working properly, target video mode isn’t working properly, external display isn’t working, etc

* Light problems and improper lighting management: battery indicator lights aren’t working, display backlighting isn’t adjusting to ambient light changes, keyboard backlights not working, etc * Power management and battery problems: Mac isn’t turning on, sleep isn’t working, random shutdowns and reboots, battery isn’t charging, Mac won’t wake from sleep, etc * Issues with your Mac cooling fans and fan management: the fans run constantly at high speed, fans run high despite low CPU usage and adequate ventilation, fans not working at all, etc Resetting a Mac SMC is particularly effective if you’re having the following types of problems: Typically, an SMC reset helps to resolve many power and hardware related issues that are otherwise unresponsive to troubleshooting techniques. When & Why Reset SMC on a Mac? Some Common Hardware Reasons We’ll show you exactly how to reset the SMC on any type of Mac (and any version of Mac OS X) and the type of problems that it may resolve.

Restore original os on apple macbook pro a1286