What you are seeing is a bad termination condition. In this case since the backlight is still visible that’s not the case. It can be defective telling the logic the lid is closed so the video signal is not sent to the internal display. One other variable is the lids Hall sensor which can also effect things. You could have one or more in mirror mode or have them in extended screen mode. Between the internal display you have two Thunderbolt ports which could be supporting either a Thunderbolt or DisplayPort display and then we have a HDMI port. Basically, the video signal needs to be routed to quite a few ports. I’m not sure if this is a hardware or software problem, or a virus I guess? Or maybe a bug on graphic switching?
But it still bothers for me because macbook pros are pretty expensive and I’m not sure if this issue will get worse in future or maybe it’s a symptom for much bigger and expensive repairs in future. For now it’s not a huge issue for me because this happens so rarely and restarting the computer fixes the issue. This does not happen during startup, this only happens maybe after using the computer for hours or even days without shutting it down. I couldn’t remember the first time it happened, maybe a month ago or so.
The only way to resolved this problem is to restart the computer, and it will work fine again. This issue only happens 2 times during my 5 year owning this macbook. I dunno know, maybe there is a bug in graphic switching? And if I unplugged the external display, the main monitor will lose its image again, but it does not happen instantly, it will take probably 4 to 5 sec before it went black again. Only if I connect it to external display the main screen suddenly works again, so both main and external display works again. The computer still works while the main display loses it image, the monitor still has it backlight, the apple logo is still glowing, I can still adjust it brightness but no image, and I can still play music. The main display suddenly disappear until I connect it to an external monitor, and then both main and external monitor will work again.
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