Mac loading half way

A teachers mac is just loading half way with the Apple logo
And then freezing

All she did was hook it up to a projector with a cable and this happened

How to fix this ?
brian ramdhaniCT Technician Asked:
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1st steps are to reset the SMC.  Then reset the PRAM/NVRAM to see if that fixes it.

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brian ramdhaniCT Technician Author Commented:
No luck
David AndersTechnician Commented:
Mac exact model? RAM? Hard drive or SSD? macOS version?
Do you have an external bootable drive?

Start with SHIFT key down
If it boots in Safe Mode, download Etrecheck, run and post report.
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