HT204267: If your Mac won't turn on
Learn about If your Mac won't turn onQ: tried installing El Capitan and now when I boot it makes one chime and nothing is displayed. Monitor works fine. The mac mini ligh ... tried installing El Capitan and now when I boot it makes one chime and nothing is displayed. Monitor works fine. The mac mini light is on but I cannot get it to boot more
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Helpful answers
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Dec 17, 2015 1:29 AM in response to adolfofromlivermoreby lllaass,- Try resetting the SMC and NVRAM/PRAM
Intel-based Macs: Resetting the System Management Controller (SMC)
- Try starting in Safe Mode
OS X: What is Safe Boot, Safe Mode?
- Boot to Recovery and repair the startup disk
OS X: About OS X Recovery - Apple Support
- If it is repairable reinstall the OSX
How to reinstall OS X on your Mac - Apple Support
- If you do not have a backup use disk utility to restore the internal disk to an external disk so you can try to recover data.
Then format the startup disk and do a fresh install of OSX