whats wrong with my laptop?
internal and external display is not working (blank screen), but the laptop is turning on.
what is the problem ?
The first thing I would do is disconnect the external display (in fact, disconnect everything except the charger cord) to to simplify the diagnostic process.
If it starts working with the built-in screen then you know the problem rests with something you unplugged.
If it does not start working it is a safe bet that the computer is not getting through the boot-up process. There are numerous possible reasons for this, such as bad RAM or corrupted PRAM.
Does the computer ‘chime’ when you power it up?
But first try resetting the PRAM. To do this start at ‘power off’. Press the power button like you are starting it up, but immediately press and hold four keys on the keyboard…. Command (four leaf clover), Option (alt), P and R. after a few seconds you SHOULD hear the computer ‘chime’. Don’t let up up the keys on the keyboard yet! Keep holing them down until the computer chimes at least two times, preferably three times. Now, release the keys and hopefully the computer will start up.
If this worked it means that the PRAM got corrupted. Why? How? I can’t tell you.
Another possible source of the problem could be the SMC (System Management Controller). Go HERE ==> https://support.apple.com/en-us/HT201295 to learn more about that.
But, hopefully the PRAM reset solved the problem. At least that’s where to start.
这个答案有帮助吗?
Thank you very much, i will try. :)
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How do you know the system is really turning on? Fan noise is not a clue. Do you get a startup bong? Does the screens color charge slightly black to dark grey?
What happened to the system? What was the system doing when it died?
由 Dan 完成的
i hear the chime and when i press the Caps Lock button the green light is on. but nothing in the screen.
由 Jose Nainggolan 完成的
OK, so we know the system is getting power, the the keyboard is responding (keycap LED) and first phase of POST is responding (bong).
Now what happened to the system? What where you doing when it died? The more you tell us to more helpful it is in trying to diagnose what needs service here.
由 Dan 完成的
Is the screen black or white?
由 mayer 完成的