This has just happened to my computer, one minute i was using it, one minute the screen went black. I thought i just needed to reboot it so i held down the power button to shut it down and then restarted it. I heard the same start up sound however i saw nothing on the screen. But after looking a bit closer i realised that the stuff on the screen WAS there but so so so faint. I also found that when i pushed f1 (lower brightness) all the way down and then back up again with f2 my screen would come up as normal for a split second. When i kept doing this (back and forth on the brightness) it eventually stayed bright in short time periods so i eventually could navigate my way to the system preferences and this is what I changed:
> Apple button (top left corner)
> System preferences
> Hardware > Energy Saver
> Untick everything under the "Power Adapter tab"
> Put the Computer sleep and Display sleep to "Never" by moving the time slider to the right
> Do the same thing for the "Battery" tab
This has worked for me so far so I just wanted to let other people know that are having the same problem. Before I did this i was contemplating taking it to the Apple store like everyone else and paying 200 quid to get it fixed. Glad I played around with it first though and I hope this means other people will be able to fix their ones too!
Doing this solved the problem for me:
- Shut down your Mac.
- Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
- Turn on the computer.
- Press and hold the Command-Option-P-R keys before the gray screen appears.
- Hold the keys down until the computer restarts and you hear the startup sound for the second time.
- Release the keys.
After resetting NVRAM or PRAM, you may need to reconfigure your settings for speaker volume, screen resolution, startup disk selection, and time zone information. If issues persist, your Mac's logic board battery (not a portable Mac's rechargeable battery) may need to be replaced. The logic board battery helps retain NVRAM/PRAM settings when your computer is shut down. You can take your Mac to a Mac Genius or Apple Authorized Service Provider to replace the battery on the logic board.
Hope it helps!
you only need a coin to flip it out.
Resetting the System Management Controller (SMC)
- Shut down the computer.
- Disconnect the MagSafe power adapter from the computer, if it's connected.
- Remove the battery.
- Press and hold the power button for 5 seconds.
- Release the power button.
- Reconnect the battery and MagSafe power adapter.
- Press the power button to turn on the computer.