My Mac Keeps Rebooting

If your Mac keeps rebooting and you've tried to open it in recovery mode without success, here are some additional steps you can take to troubleshoot the issue:

1. Safe Mode:

- Try booting your Mac in Safe Mode by restarting it and holding down the Shift key immediately after you hear the startup chime. Safe Mode performs a basic check of your startup disk and loads only essential system components. If your Mac boots successfully in Safe Mode, it may indicate that a third-party extension or software is causing the issue.

2. Reset PRAM/NVRAM:

- Resetting the PRAM (Parameter RAM) or NVRAM (Non-Volatile Random-Access Memory) can sometimes resolve startup issues. To do this, restart your Mac and immediately hold down the Option + Command + P + R keys simultaneously until you hear the startup chime a second time.

3. Reset SMC:

- Reset the System Management Controller (SMC) on your Mac. The procedure for resetting the SMC varies depending on the model of your Mac. Refer to Apple's official support documentation or contact Apple Support for instructions specific to your Mac model.

4. Disk Utility:

- Boot into Recovery Mode again and use Disk Utility to run First Aid on your Mac's startup disk. This will check for and repair any disk errors that may be causing the rebooting issue.

5. Reinstall macOS:

- If none of the above steps resolve the issue, you may need to reinstall macOS. Boot into Recovery Mode, select "Reinstall macOS" (or "Reinstall OS X" depending on your macOS version), and follow the on-screen instructions to reinstall the operating system. This process will reinstall the macOS system files without affecting your personal files.

6. Hardware Diagnosis:

- If the problem persists after reinstalling macOS, it could indicate a hardware issue. Consider taking your Mac to an authorized Apple service provider or Apple Store for further diagnosis and repair.

If your Mac continues to experience rebooting issues despite these troubleshooting steps, it's recommended to seek assistance from Apple Support or an authorized service provider for further assistance. They can provide personalized support based on your Mac model and specific situation.

Regards

Constant rebooting usually insiuates a failed or failing power supply. However it also it's possible it may be cause by something that has been installed on the computer.

It will help us get a good idea of what is causing your problem if you provide a report of your system, that way we do not have to play 20 questions with you. The report we are requesting does NOT provide any personal information and is extremely safe to use. Please navigate to www.Etrecheck.com and download the free version of EtreCheck. Once you have you downloaded the app and installed it, please run the report and save it. This report will help us get a good idea what has been installed on your system and help us be able to diagnose what may be wrong.

When you have your report, you can attach it when you reply to this message and we can then review it and help you determine what is needed to get your system running well again. 

For instructions on how to download your EtreCheck report and attach it to your reply to this message please click How to use the Add Text Feature When Post… - Apple Community It is helpful to us if you download the report to your Desktop.