I've seen electronics in faulty topcases (usually in A1181s) cause a machine to "stick" in odd video and sleep related modes, so it would be useful to rule that out.Īlso, try disconnecting the PRAM battery, and powering on with it disconnected, and then powering on again with it re-connected.
Lastly, I would try disconnecting the topcase/keyboard entirely, and jumping the machine's power via the power-on pads on the board. I don't think it's a bad cable, because effectively neither cable is seeming to work, and it would be unusual that both were bad, so that points to it probably being another issue.
It's rare a screen would be so dead that it would neither display light nor an image, but it could happen. If that doesn't work, you might want to go to System Preferences/Displays and see if it shows a means of switching back to the internal screen (I know you didn't see if there before, but I'm wondering if the PRAM reset might "jolt" it back into existence).īeyond that, it might be a completely dead screen. I would reset the PRAM, because if this is the case, it should set it back to the default mode, which should be to display video on the internal screen. It's a longshot, but I'm wondering if your machine might be stuck in an "external monitor mode" of some type. External video works, so you know you don't have a bad video chip. The fact that you see neither is a little odd, and suggests this isn't a typical problem. If the video system (screen, video cable, board) is out, you would generally see an odd bluish/greyish light with no image, courtesy of the inverter system. If the inverter system (screen, inverter, inverter cable, board) is flawed, you should still see a faint image courtesy of the video system. There are two components to the display - the inverter system, which provides the light, and the video system, which provides the image. It's odd that the screen would be completely dark with no faint image. You can enjoy your family vacation photos. With your AirPods connected to your Mac, click the little headphone symbol in your Macs. And finally, when I close my laptop, the computer doesn't go to sleep like it usually would - it remains functioning with the external display.Īll of which is to say, as far as my computer knows, the LCD display is completely nonexistent.ĭoes this seem like a problem with the display cable, the LCD screen itself, or some other element? An external display connection allows you to mirror and present the content in your MacBook Pro on a large screen. Method 3: Refresh Touch Bar from Activity Monitor on MacBook Pro. Furthermore, when I press F1 and F2, as you would to adjust the LCD brightness, no onscreen graphic appears. I can tell by looking at the computer's "Display" list that the LCD screen isn't recognized at all - the only display listed is the external one. When hooked up to an external display, the computer is still fully functioning.
Up until that point, it had been functioning completely normally, no visual glitches or issues - the display simply didn't turn back on after restart. Yesterday I restarted my Macbook Pro to find that the LCD display wasn't working - there's not even a dim picture, it's just completely black, as if the display was asleep.