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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serialbandCommented:
1st steps are to reset the SMC.  Then reset the PRAM/NVRAM to see if that fixes it.

https://support.apple.com/en-us/HT201295

https://support.apple.com/en-us/HT204063
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brian ramdhaniCT Technician Author Commented:
No luck
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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  https://support.apple.com/en-us/HT201262
If it boots in Safe Mode, download Etrecheck, run and post report.  https://etrecheck.com/
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