My Mac won’t load and start up

See if the following can help:

• If your Mac doesn't turn on - Apple Support
• If your Mac doesn't start up all the way - Apple Support
• Mac Basic Startup Troubleshooting Steps - Apple Community

There are various reasons that makes the mac system unbootable and you find your mac won’t turn on. However, the issue can be resolved using below DIY methods:

1. Ensure your mac has a power

2. Check the hardware

3. Perform a power cycle

4. Reset the SMC

5. Reset PRAM/NVRAM

6. Boot in Safe Mode

7. Restore from Recovery Mode

8. Reinstall macOS

Hope it helps!