Persistent blue or grey screens when you boot up your Mac tend to be caused by a peripheral. Power off the Mac. Disconnect everything except the power and the keyboard and mouse if external , and now restart. If the Mac starts up normally, it's a problem with a peripheral. To find out which one is at fault, reattach them one by one and start up each time, until the problem reoccurs. Once you've found the culprit, Google the problem and the name of the peripheral to find out what others have done to fix it.
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If the Mac won't boot with all peripherals disconnected, try booting in Safe Mode by holding down the Shift key when you restart. Occasionally, doing that then restarting fixes the problem. If not, boot into the Recovery partition and follow the steps in the problem above. When you turn on your Mac you should hear a tone. The type of tone can change depending on any problems your Mac might be experiencing, so they are a good way of figuring out what's preventing your Mac to properly start.
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First of all, check that the Mac is connected to a power supply, and that the power cable is secure. Then you should check that the power socket is switched on and working. Test it with a lamp! Next, eliminate the possibility that it's a display problem. Is there a startup chime? Can you hear the fan? Is the sleep LED lit?
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Does the caps lock key light up when you press it? If the answer to any of those questions is yes, it may be a problem with the display. If it's an external monitor, check its connection. If that's okay, try connecting a different display.
If the answer to all of those questions is no, try resetting the system management controller SMC. Get thee to a Genius Bar. Protect your Mac with one of the best Mac VPN options The Mac won't start and it shows flashing question mark The flashing question mark folder is a sign that your Mac is having trouble locating its system folder. You'll need to start up again from the Recovery partition and reinstall OS X. Click the Repair Disk button to verify and repair any issues with your startup disk.
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After your disk is successfully repaired, quit Disk Utility. Choose Startup Disk from the Apple menu. If Disk Utility can't repair your startup disk If Disk Utility finds issues with your startup disk that it can't repair, you might need to reformat it. The drive needs to be the same size or larger than your current startup disk.
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It also needs to be a drive that you can erase. Make sure that you select the external disk as the one you want to erase.
What You should Do When you Meet a Flashing Question Mark on Mac
Don't select your built-in startup disk, usually named Macintosh HD. After installation is finished, your Mac automatically restarts from the external drive. When Setup Assistant appears, select the option to migrate your data from another disk. Choose your built-in startup disk as the source to migrate your data from. When migration is done, complete the steps of the setup assistant. After the desktop appears, confirm that your data is present on the external drive.
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Now that you've made a backup to an external drive, follow these steps: Select the built-in startup disk as the one you want to erase, not the external drive. When installation is finished, your Mac automatically restarts from your built-in startup disk. To copy your personal data back to your startup disk, select the option in the setup assistant to migrate your data from an existing Time Machine backup or other disk.
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