Turn on your Mac, then immediately press and hold the D key on your keyboard. ![]() By the way, if you are on an iMac, the Power button is. This is an alternative key combination to force restart a Mac. If your Mac hangs for good and the pointer is inactive: Hold down Control-Command while pressing the Power button. Make sure that your Mac is on a hard, flat, stable surface with good ventilation. The simplest method: hold down the Power button till your Mac shuts down. Refit the battery and restart the Mac.Īpple leads owners through a whole list of things to try before resetting the SMC, but since there doesn't appear to be any downside to doing this, and it's simple to do, I tend to just jump straight to giving it a go. Disconnect all external devices except keyboard, mouse, display, Ethernet connection (if applicable), and connection to AC power. Then press and hold down the power button for five seconds. Laptops with removable batteries (older MacBook systems): Disconnect the system from the power supply and remove the battery.The simultaneously release all the buttons before starting the Mac normally. Laptops with non-removable batteries (newer MacBook systems): With the system plugged to a power supply, press and hold SHIFT and OPTION and CONTROL and then press the power button (it helps if you have three arms or an assistant).Desktop systems (iMac, Mac Pro): Disconnect the power cord, wait 15 seconds, plug it back in, and then wait a further five seconds before turning the Mac on again.However, how you go about doing it depends on which Mac you have: This one tip can fix a whole raft of Mac issues. The following is information that all Mac owners should know, and can help prevent you having to take an unnecessary trip to see a Genius at your nearest Apple Store. McDonald's just threw technology out the window (well, its customers did) Microsoft Patch Tuesday: 64 new vulnerabilities, including five critical ones I'd like it if you chose to follow me on Twitter so I can let you know when fresh items are published here first on Computerworld.The two smart devices I will never install in my house You can do this by restarting your Mac and holding the D key. Got a story? Drop me a line via Twitter or in comments below and let me know. Accessing Mac Hardware Diagnostics Mode If something is wrong with your Mac, either you or the tech repairing your Mac will need to access the special diagnostics mode. Hold these keys down for around 20 seconds. Google+? If you use social media and happen to be a Google+ user, why not join AppleHolic's Kool Aid Corner community and join the conversation as we pursue the spirit of the New Model Apple? The easiest way to do this is to press the Option + Command + P + R keys simultaneously as your Mac turns back on. May all your problems be software-based and easily rectified. While this sounds like a great deal of hassle, don’t be too down hearted – even if you do have to replace the OS and reinstall all your digital stuff, this is still much cheaper than a full hardware repair. When that doesn’t seem to help you may need to reinstall your system (I hope you have backup). This could be good news as it suggests OS X Recovery will be able to patch most common problems – just launch Disk Utility from within that petition and fix your disk. You may have expected to find a hardware problem but none has been found. If you have an identified hardware issue then the best thing you can do is use this system to make a call to Apple Support, as that’s a good way to find out more about the problem (even if you can’t afford to fix it immediately). VFD001-VFD005: This is the one that I’ve seen most often, it means “Display issues” have been identified. NDD001: USB hardware isues (NDL001 indicates Bluetooth hardware problems). I’ll be honest, there are plenty of these codes – you’ll find a complete list right here at Apple Support, but here are ten to get started with:ĬNW001-CNW006: Wi-Fi hardware problems (or CNW007-CNW008, which means now Wi-Fi hardware has been detected, which may also be a problem if you think you have such hardware). What are the other most useful Apple Diagnostics codes? That’s good news as it suggests the problem you may be experiencing is not hardware-based. The diagnostics code every Mac user should want to see is ADP000. What is the most important Apple Diagnostics code? If you want to restart your Mac just press the R key (or S to Shut Down). You can send the error codes to Apple to access details about these problems and how to repair them. ![]() Your Mac will then boot into macOS Utilities. Release the button when you see the Apple logo. Immediately, hold down the Command key and R together. Once you do, hold down the power button to turn on your Mac. If you choose to do so your Mac will restart in OS X Recovery and Safari will launch Apple’s support pages. 1) Hold down the power button to shut down your Mac. You can send any error codes you receive to Apple using the Get Started link that appears. How do I use Apple Diagnostics information?
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