Check the power cable as well. On an Apple-supplied keyboard, including those built in to a MacBook, the F1 decrease and F2 increase keys are used to adjust the brightness. On non-Apple keyboards, the F14 decrease and F15 increase keys will adjust the brightness. Is the power turned on?
Mac troubleshooting: What to do when your computer won't turn on | Macworld
Check to see if the power cables are plugged in, and make sure that any power strip or UPS that the display or your Mac is plugged into is also turned on. Use the F2 key on your Mac keyboard, or the F15 key on a PC keyboard, to increase the brightness of your display. Press and hold the power button for about 15 seconds; this will ensure that the Mac is indeed turned off.
The next step will be to turn your Mac on. When you perform this step, you want to carefully listen for one or more of the following sounds. First, listen for the Mac startup chime. If your Mac is earlier than a late model, it should produce a startup chime. If you have an attached keyboard, you can try pressing the caps lock key to see if the caps lock indicator light turns on, indicating there is power present at the keyboard. If you find no evidence of the Mac turning on, try the test again using a different power cable, a different outlet, or bypassing any power strip or UPS you may be using.
For MacBook users, make sure the battery is charged. You may need to leave your Mac plugged in to charge the battery if it was fully depleted.
You already performed a basic power cycle when we started this sequence of tests by holding down the power button for 15 seconds. This time, however, the sequence is slightly different. Hold down the power button for 15 seconds to ensure your Mac is turned off, then unplug your Mac from any electrical outlet and wait 30 seconds. Plug your Mac back in, turn it on, and listen for any of the startup noises we mentioned earlier.
2. Reset the SMC
There can be a number of issues that can prevent your Mac from completing the startup process. One of the first steps I suggest performing is to disconnect all of your peripherals, except for the display, mouse, and keyboard. This includes any external drives, printers, expansion boxes or hubs, as well as any cables associated with them that are connected to your Mac.
Once everything is disconnected, restart your Mac. At this point, the task is to try each item, one at a time, to discover which one is causing the problem. Originally released in , the iMac is Apple's all-in-one desktop computer. The current version model offers Michael is an editor for 9to5Mac, 9to5Google, and Electrek. April Where is the power button on iMacs?
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Michael Potuck - Apr. For more help getting the most out of your Apple devices, check out our how to guide as well as the following articles: Where is the power button on new MacBooks? If the memory doesn't function, your computer has nowhere to save temporary data so that it will fail to boot.
12222 Best Solution to "Mac Won’t Shut Down" Issue [100% Work]
If you managed to fix your Mac but the issue repeats, there may be something wrong with your Mac's system. You can fix your Mac via Recovery mode.
Follow the steps to enter Recovery mode:. When you see an Apple logo, release the keys.
Then you will see several tools to fix your computer. Notice that you should backup your user data before you reinstall macOS or get your Mac restored. Then after the Mac boots up, how can you recover the deleted files?
Mac Won't Turn On? Here Are Fixes
Confirm that the monitor is compatible with your Mac and all cables are firmly connected. Remove other devices between the Mac and monitor. Try a different monitor or adapter.
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