how can i get my desktop to turn on? I had low electric power coming into the house for a few hours. Now when I turn on the computer the progress line only goes a 1/4 of the way and then everything shuts off. Can this be fixed?
Since the computer is attempting to boot most likely you have either a file system issue, a damaged system file, or perhaps a failing hard drive. It is also possible the power supply was damaged or weakened by the electrical issue. If you boot using Verbose Mode the computer will display the boot log on screen. When the boot process gets stuck look to see if there are any I/O errors listed which would indicated a bad hard drive.
Try booting the Apple Diagnostics.
Try booting into Internet Recovery Mode using Command + Option + R which will bypass the OS on the internal drive.
If you have an external macOS bootable drive you can also use that to test your iMac. Another option would be to boot from a live Linux USB drive such as Knoppix which will allow you test check and confirm a hard drive failure (I can provide instructions if you are interested).
Since the computer is attempting to boot most likely you have either a file system issue, a damaged system file, or perhaps a failing hard drive. It is also possible the power supply was damaged or weakened by the electrical issue. If you boot using Verbose Mode the computer will display the boot log on screen. When the boot process gets stuck look to see if there are any I/O errors listed which would indicated a bad hard drive.
Try booting the Apple Diagnostics.
Try booting into Internet Recovery Mode using Command + Option + R which will bypass the OS on the internal drive.
If you have an external macOS bootable drive you can also use that to test your iMac. Another option would be to boot from a live Linux USB drive such as Knoppix which will allow you test check and confirm a hard drive failure (I can provide instructions if you are interested).
Safe Boot, (holding Shift key down at startup), does the problem occur in Safe Mode?
Thank you for taking the time and effort to help me. I did try the Internet Recovery Mode when Apple tech support was helping me. I think the problem is a failing hard drive. It is so nice to know that there are people who are willing to help. Thanks again!
Any luck yet?
The problem still occurs in safe mode. Apple tech support was not able to help me get it to boot up. Thanks
No luck yet! Thanks for asking. I ordered a new computer!
had low electrical power to desktop and now it will turn on, but the progress line slowly moves about 1/4 the way and then it shuts off and screen goes black
