

The latest models that support this method are Mid-2012 ones. Note: This method may be performed only on MacBooks with user-replaceable RAM. Method #5: Remove and Reload the RAM (Mid 2012 and older MacBooks)
HOW TO TURN ON MACBOOK PRO BLACK SCREEN HOW TO
For detailed info how to reset SMC on your particular model check the Reset (SMC) System Management Controller section in the following article slow macbook pro. You will need to perform SMC specific reset method depending on the MacBook model you are using. SMC may resolve problems with fans, displays, sleeping issues, etc. This carries settings for anything that is power management related. SMC stands for System Management Controller. Keep pressing these keys until you hear the second startup sound.Once you hear the startup sound, press and hold COMMAND + OPTION + P + R.Press the power key to boot up your Mac.
HOW TO TURN ON MACBOOK PRO BLACK SCREEN MAC

Setting the brightness all the way down (by pressing the lower brightness button) and bumping it up to max (by pressing the higher brightness button) makes your screen content visible for a second. If you can look a bit closer, you may realize that there is stuff on the screen, but it is so faint, almost invisible. Note: Before jumping on the solutions below, make sure your MacBook Pro has a battery juice, or is plugged into a power source.

If this sounds familiar to you, here is how to fix it. But, there is nothing visually happening on its screen. Restarting the MacBook in these situations results with startup sound as normal. People usually report that one minute they were using it as normal, and the next one its screen went black. This problem may happen while in the middle of a working session on your MacBook Pro. Many MacBook Pro users are complaining about experiencing a black screen problem on their device.
