![]() If you're lucky you may get to know what the issue is performing this test. I got an AHT screen where you have to select your language and then perform hardware tests, I start the test and I waited around 3-4 hours until I realized that I was stuck and nothing was happening. Any hardware abnormalities can be detected ( read more ). Press D Button when you hear the Chime on boot to start Apple Hardware Test (AHT). But it didn’t resolve the issue, nor I was able to start my Mac in Safe Mode. I followed these steps and I could head the chime sound. Keep holding these keys until you hear the chiming voice twice. Now restart your system, and quickly hold down Command (⌘) + Option (alt) + P + R keys ( yeah you need to hold down all these 4 keys together so better locate them before you do a restart).ģ. Shut down your Mac by holding Start/Shut down keyĢ. Information that NVRAM/PRAM stores are, Screen resolution that you may have set, the Speaker Volume, Startup disk to be selected and Kernel panic information. NVRAM is a memory area that stores certain data related to a system that is persistent even after shutdown. You must always try doing a Safe Mode Boot as the first troubleshooting step, for Mac try doing a safe mode boot by holding down Shift Key during boot time (when you hear the chime sound) until you see an Apple Logo and a spinner and a progress bar. ![]() Release the power button and press it again to start up for mac Mini. Plugin the power cord simultaneously press and hold the power button. Unplug all cables, USB, HDMI and even the power button. Force Shut down (Pressing Power button for 10 secs)ġ. Resetting PMU also resets PRAM settings and it should be tried only after none of the below works, 1. Resetting PSU can resolve hardware failures related to power management. controlling HDD spin down, sleep and wake up and devices that are attached to the computer. Power Management Unit (PMU) is a chip responsible for Mac's power management i.e. Note that if you do a Force Shutdown when your system is running you may lose all your unsaved data, but not in our case as the OS is not getting loaded on the first-hand :P Press and hold the Power Button on your Mac Mini ( or equivalent on your Mac Book, Mac Book Air) for 5-10 secs. Reconnect your system after 10-20 mins with minimum peripherals ( keyboard and mouse ) and see if things get back to normal. USB devices, HDMI cables, Mouse & Keyboard, etc, and the power cords. Turn off your PC and remove all connections. This may sound weird, but it does works sometimes. You have to get a wired keyboard preferably apple one ( i borrowed a Microsoft USB keyboard but it too did work, then I got a Logitech keyboard and it did work) Note : Before we talk about this a really important note if you have a wireless Apple keyboard ( or maybe any other brand wireless keyboard) boot key combinations won’t work (though it may work for newer versions, mine is 2012 make). I am putting down all my experience here so that someone may find it useful.Īpple Startup Key Combinations (Intel-based Macs) It took me 2 days to restore my Mac Mini and to get all my data back. Everything pointed out that I could be that the Hard-disk is dying. I did some google search and found out that many people were facing this issue. Recovery & Troubleshooting Mac Mini/Mac Book First thing I realized that I didn’t do my weekly backup! If it turns out to be an OS crash or HDD failure I would lose all my data. I did a restart again, but it was all the same, Gray Spinner and the Progress-Bar reaching unto 25% and the screen goes blank. Just a few minutes later (25% completion of the progress bar) the Monitor went black and the Mac turned off. Mac OS X Grey Color Screen with Spinner and Progress Bar
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