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We can try some basic troubleshooting steps. First reset the PRAM and NVRAM of your Mac
Reset PRAM and NVRAM
If that didn't work, then boot your Mac into Safe Mode. Turn off your Mac. Turn it back on and Immediately hold down the Shift key. Release the Shift key when you see the gray Apple and progress indicator. Let the Mac boot up to Safe Mode.
Let me know if that didn't work, so we continue troubleshooting. Don't Rate my answer until you are satisfied.
In safe mode a grey bar appeared, filled up one third and disappeared, back where we started
problem fixed. Thanks