Check your connectionsīeyond asking, “Is it plugged in?” we have a few more obvious issues that can often fix startup problems. If you don’t know how to do that, see below. If you’ve determined that your Mac is actually on and not responding, you can try the old panacea: a restart. If you’re using an external display, look for a power indicator LED on the front, and check that the cable connection is secure.
You can tell by checking the contrast on a MacBook or iMac between the black bezel and the display-it should blend seamlessly if it’s powered down. If it’s a deep black, the screen is definitely off, but if the color is more like an extremely dark gray that’s close to black but not quite, it’s on.
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