The reasons for that range from the relatively benign you've previously started up from an external disk and unplugged it to the more serious your Mac's hard drive has failed catastrophically. Whatever the cause, you'll find advice and fixes to help in the following article. Read next: How to fix a Mac that won't turn on.
We also have a complete guide to fixing some of the most common Mac issues and How to start a Mac in Safe Mode. Assuming you're trying to boot from your Mac's internal drive, the first thing to do is shut down the Mac by holding down the power button, then start up while holding the Command and R keys until you see an Apple logo or globe. This puts your Mac in recovery mode. Click on your startup drive and click the First Aid tab.
Click Run. If the repair completes successfully, you can select the disk in Startup Disk in the Apple menu and restart. Method 1. Disconnect External Peripherals Method 2. Repair Disk using Disk Utility Method 3.
Safe Boot Method 4. Repair a Startup Drive Method 6. Reinstall Mac OS X. Shut down your Mac by pressing and holding the power button. You have to now hold down the Command and R Keys to power the Mac back up again. The screen that now pops up will be headlined OS X Utilities. Select the second listing for your built-in drive. Disconnect peripherals except for keyboard and mouse.
Restart your Mac. If you got the lucky go, reattach your peripherals one-by-one, restart after each attachment and find out if it was any of the peripherals that got your head heating. Files overwritten? Recover it. Top 5 Mac recovery tools. Get USB drive files on Mac. Recover a formatted SD card. Fix Your Mac Mac won't turn on? Know and fix kernel panic. You installed macOS anyway. Force quit Mac to fix issues.
Make frozen Mac responsive. Delete Your Mac Delete files and folders. Do Ctrl Alt Delete on Mac.
Start the computer holding the option key. See if you get the option to select the flash drive.
Just a thought. Join Date Feb Location on the landline, Mr. Smith Posts 7, Looks for local partition first, then on to internet.
Should work even with no internal boot drive EFI based as I recall. Review this :.
This happens to us all the time with computers, and nobody thinks of complaining. Join Date Aug Posts 1. Hi All, I too have a problem.
Question mark when I put in the new drive. Tried to burn an image using transmac but it would not recognize the USB as a start up when using the Option. Command R is for restoring your OS.