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My 2015 iMac does not boot at all. It goes to a white screen for a about 10 seconds, then goes to the question mark folder. Holding command+r, command+s, whatever, does nothing.
I have bought a new iMac so i wanted to use this old one a s a 2nd screen but after wiping everything ogg I can't get it back up again.
nothing seems to work
Please help!!!
Selman.
iMac 27", macOS 10.14
If you erased the hard drive, then it no longer has a bootable operating system which is why you are getting the blinking folder with a question mark. Try using Internet Recovery Mode using Command + Option + R to see if you can reinstall macOS. If you are going to use the old iMac as a secondary display, I'm not sure this is necessary. If your hard drive is failing it could make it difficult to access other modes.
If you erased the hard drive, then it no longer has a bootable operating system which is why you are getting the blinking folder with a question mark. Try using Internet Recovery Mode using Command + Option + R to see if you can reinstall macOS. If you are going to use the old iMac as a secondary display, I'm not sure this is necessary. If your hard drive is failing it could make it difficult to access other modes.
Follow the steps at > If your Mac doesn't turn on or start up - Apple Support
My 2015 iMac does not boot at all
