My name is ***** ***** certified professional with over 10 years experience. I will be glad to assist you with this.
I am sorry to hear that you are having this issue.
What is the version of your os on the Mac?
Okay, thank you.
Try and boot your Mac in Safe Mode, press and hold the ppwer button for 60 seconds, thrn wait a few seconds and press the power again and hold the Shift key while it boots. You can stop holding the Shift key when you see an Apple logo and progress bar. To leave Safe Mode, just reboot your Mac without holding the Shift key.
you can also try booting to the Hardware Diagnostics Test.
On Macs released before June 2013, Apple Hardware Test (AHT) will appear instead of Apple Diagnostics.
To access this tool, press and hold the D key while booting your Mac. Select your language and your Mac will automatically test its hardware and inform you if anything is wrong.
If that fails Press Command + V to boot into verbose mode. You’ll see the terminal messages appear during the startup process. If everything goes properly, your Mac will boot to its normal desktop. Let em know the last message in that thread.