What: Reset NVRAM on your Mac - Apple Support.Why: Resets fans, keyboard backlight, status indicator, battery indicator, display backlight, power button, close/open the lid, sleep or shut down, battery doesn't charge, MagSafe indicator light incorrect status.You simply just restart the Mac to reset them. On the other hand, Apple does not provide a method to reset either the SMC or NVRAM on the M1 Macs. Be sure to use the appropriate section in the link above. How: How you reset the SMC is different between Intel Macs with (2018+) and without (mid-2009-2017) T2 chips.What: Reset the SMC on your Mac - Apple Support.Reset the Mac's System Management Controller (SMC) - Intel Macs Only.How to Use Apple Hardware Test to Diagnose Mac Problems - OSXDaily.About the "Apple Hardware Test does not support this machine" message - Apple Support.How to use Apple Hardware Test on your Mac - Apple Support.Release when you see the startup options window, which includes a gear icon labeled Options. For Silicon Macs: Turn on your Mac and continue to press and hold the power button as your Mac starts up. Release when you see a progress bar or you're asked to choose a language. How: For Intel Macs: Turn on your Mac, then immediately press and hold the D key on your keyboard as your Mac starts up.What: Use Apple Diagnostics to test your Mac - Apple Support & Apple Diagnostics reference codes - Apple Support.Apple Diagnostics (2013-2020 Intel Macs & 2020+ Silicon Macs).Run either the Apple Hardware Test (AHT) or Apple Diagnostics to uncover any potential hardware issues with the Mac. ![]() Why: To repair a corrupt file system and to perform a "quick" system disk repair pass.How: At boot-up, hold down the Shift key until the Apple logo appears on the screen, then release the keys.What: Use safe mode on your Mac - Apple Support.(Note: This User Tip is applicable for all Mac desktops and laptops.) Mac displays a black or grey screen? It's having an issue with either damaged or incompatible startup items or software.Mac displays a screen with a folder that has a flashing question mark? It's having trouble locating the operating system.If possible, reseat individual RAM modules. (see step 4) No luck? Chances are it could be the Mac's power supply, logic board, or the SMC. Power available? For Intel-based Macs, try resetting the SMC.Reset power breaker/GFI replace power cable or brick. No power? Recycle the Mac's power switch.Check the power source, power cable, etc.There may be an issue with the audio hardware. There may be an issue with the graphics processor. There may be an issue with a storage device. There may be an issue with the SD card reader. You can continue to use the battery until you replace it, without harming your computer. The battery is functioning normally but holds significantly less charge than it did when it was new. The computer requires service.Ĭheck battery communication cable on 2015 and later models. You can continue to use your battery before it’s checked without harming your computer. The battery is not functioning normally, though you may not notice a change in its behavior or the amount of charge it holds. It is functioning normally, but holds less charge than it did when it was new. The battery will need to be replaced soon. There may be an issue with the processor. There may be an issue with the power adapter. ![]() There may be an issue with the onboard memory. ![]() There may be an issue with a memory module. There may be an issue with the computer's firmware. Often means thermal or current sensor failure. There may be an issue with the System Management Controller (SMC).Īlmost always means that there is a short or a missing communications line (data and/or clock) between a component and the SMC. Use Apple MRI to gather more information. If your device is newer than 2013 or you booting it online from some older devices, there's AD which is much less reliable and kind of helps you to book an appointment in Genius Bar instead of showing the real issue.
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