4/30/2023 0 Comments Mac shutdown sound 90s![]() This same completely black condition is allowed when running recovery mode, target disk mode, etc at boot.I also turn it off when leaving the room and the computer has restarted due to an (unrelated) kernel panic while unattended a few times this past year. While most people probably don’t turn their screen completely off, I do so routinely when I have the laptop connected to an external monitor (I leave the clamshell slightly open to avoid going to sleep, as I’ve run into glitches there before). The brightness is only increased to a minimum value AFTER you log in. If you completely black out the screen when you shutdown, both the Apple logo and login screen are completely black at startup (no back light at all, even if you tried to view in a dark room). The screen brightness at bootup is the same as whatever it was when shutting down the machine before.The reason for this is long-winded, but essentially because Apple apparently never thought of this scenario, so made some decisions which would screw things up in this edge case. When he restarted it, it appeared to be dead. He then shut it down for use while mobile. So he routinely leaves the machine open, but turns down the screen brightness to zero (backlight fully off) to avoid distraction. The backstory here is that Benz works on an external monitor, but says he’s had problems in the past using a Mac laptop in clamshell mode, with glitches causing them to sometimes sleep. The MacBook Pro problem didn’t, in fact, exist. The screen brightness was turned all the way down (not merely dim, but off). So after losing about 2 weeks of my time, >$10,000 in Apple warranty repairs (2 logic boards, new cables, and a complete replacement of a >$7000 computer), troubleshooting input from several Apple Geniuses, level 1 and 2 tech support from Apple Corporate, diagnostic tests at the Apple Store, and diagnostic tests twice at Apple’s repair facility in Texas what was the root issue? The only other indication that anything was alive was that the machine would still make an audible chime when plugging in power and the capslock key light could be toggled off and on. Just like before, the screen was pure black after clicking the power button and there was a slight fan sound. The first 2 motherboard replacements seemed odd, but I was given a completely new laptop from Apple on the 3rd failure. My laptop “failed” again for the 4th time today. Photographer and developer Greg Benz tells the story. What appeared to be a major MacBook Pro problem resulting in $10,000’s worth of warranty work finally turned out to be a ridiculously simple fix taking seconds and costing nothing at all … Update: Benz has clarified that the behavior of his machine turned out to be due to some kind of software conflict, making it more reasonable that no-one had suspected zero brightness earlier. ![]()
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