What to do when you turn on your iMac and after a few mins, the message "unable to boot, please insert boot up disk".
There is a secret!! Please follow the steps strictly.
1. Turn off your computer
2. Turn it on and immediately press "Command, Option, P and R" simultaneously i.e. all 4 buttons must pressed at the same time.
3. Listen to the disk drive startup.
4. When you hear the disk drive start up 3 times, release the buttons
This is iMac Reset.
If this still fails, bring your iMac to Apple Service Center.
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