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If a replacement monitor, a different cable or other display tricks don't help, then you should have your Mac checked for a graphic error. You should only check whether the monitor is switched on or correctly connected if the screen remains permanently black and does not alternate with the Apple logo or is detached from the login screen after a while.Ī missing image can of course also indicate a defective graphics card / a faulty GPU chip or a broken graphics unit in the Apple SoC. When starting macOS, during an update or a new installation, such a display, the desktop background or the like can be displayed again and again. If a black screen, greyscreen, blue screen or any other monochrome screen is displayed when the Mac starts, this is not abnormal. When updating macOS or reinstalling the operating system, the Apple logo and the loading bar may be displayed for a long time. If the Apple Mac cannot connect to a local startup volume, it will search for a network startup volume. Since this procedure is the standard, the apple, the loading bar and / or a loading circle should always be visible if there are no problems booting the Mac. The Apple logo (usually with a progress bar) indicates that a local hard drive installed in the computer was found to start the Mac. Sir Apfelot recommendation: Clean up your Mac hard drive with CleanMyMac Apple logo

What problems and error messages when booting the Mac do each icon indicate? What do the globe, question mark, warning and prohibition symbol, USB, Thunderbolt and FireWire symbol mean? And why do you have to enter a PIN? Here you get the answer to your question! Which problems and error messages the individual symbols indicate when booting the Mac, you can read here in advance - or see if you are looking for a solution without the Mac, but via iPhone or iPad ) Im Below you will find the background to the question mark, the completely black or gray screen, the rotating globe, the lock symbol, the USB, Thunderbolt and FireWire symbols and other indicators of boot problems on the Mac. If the Mac no longer boots properly and displays an unfamiliar icon (instead of the Apple logo), then it's too late to google. 13 Mac guides, manuals, books, and more.