The electricity tripped while my Mac was in use. When the electricity came back on, I tried to switch back on Mac but all that happened was it chimed and stayed on a grey screen with the apple logo and timer going around and around as if it is loading. Any suggestions?
iMac, iOS 5.1.1
Follow these steps:
Restart your Mac with the Shift button pressed.
- Shut down your Mac
- Wait until your computer turns off and after that press the Power button
- Right after you hear the startup tone, press and hold the Shift key
- Release the Shift key when you see a grey Apple sign and the progress bar below this sign
- Once you see Desktop, start a Disk Utility scan to detect and repair file system errors (don't forget to choose your main hard drive)
- Click on Verify Disc and then, if asked to fix problems, on Repair Disk
- After this, click on Verify Disk Permissions and then on Repair Disk Permissions
- After the process is finished, shut down your Mac and turn it back on after about 30 seconds
Apart from that, take a look at this Apple article and follow the instructions on Resetting NVRAM shown there:How to Reset NVRAM on your Mac - Apple Support
Take a look at the steps suggested by Apple in this article:
https://support.apple.com/en-us/HT204267
Hope this helps
Electricity tripped and now Mac won't start up
