The display screen might appear black or gray at this point in the startup sequence, and the display's backlight should turn on. If you've added memory to your Mac, check to make sure that it's installed properly.Īfter the power-on self-test is complete, your Mac sends a video signal to your built-in and connected displays. If you hear additional beeps or chimes at this point, this indicates a possible hardware issue and the startup sequence halts. It then performs a power-on self test (POST) and a BootROM test. Your Mac initializes its BootROM and memory (RAM). When you first turn on your Mac, the screen is black and you hear a startup sound if your Mac is from early 2016 and earlier. Specific to a black screen, here's some information: Here's some information about screens you may see when you start up your Mac:Ībout the screens you see when your Mac starts up - Apple Support I'm sure you're eager to have your iMac working properly, so I'll be happy to look into this with you. Welcome to Apple Support Communities! It sounds like your iMac goes to a black screen every time you try to restart your iMac.
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