Recently I tried to do a clean re-install of an old MacBook Pro, but the command+R+power button old trick did not work its magic ? the Mac refused to turn on.
The machine worked fine a while ago but were left alone untouched for a while. No liquid damage happened. So it?s unlikely caused by an external damage. What then cause the problem and how to fix it?
When pressing the Power button, there is no startup ?chime? or other sound. It?s likely to be a power issue with the Mac. Doing a SMC reset could potentially resolve the issue. How to do a SMC reset? Press shift + control + option and the power button for ten seconds!
SMC Reset For Mac
Pay attention to the MacSafe Power Light, if the color of the light is orange/amber, it means the mac is currently charging. If the color is green, it means the Mac is fully charged. My Mac was not fully charged, but the color was green ? an indication that something was off.
After doing a SMC reset, the light will become green for about two seconds, then turn orange/amber.
If the mac still does not turn on after a SMC reset, open up your Mac, disconnect the logic board and then reconnect it. This may help as well!
Don?t get intimated by opening up your Mac with a screw driver (for Philip Screws), it could save you several trips to the Genius Bar and $$$.
