New Mac froze overnight. Tried to power up just grey screen spinning.

New 21.5 iMac froze over night. Now just grey screen spinning wheel. No safe mode. Able to boot up in recovery disc once. Fixed permissions ? Restarted to no resolve. Tried again but mouse not working past mouse start up click freeze... Have also looked and found a problem boot cache control : unable to open..
Any ideas any one this Mac is 3 weeks old

I'd return it myself, but...
Bootup holding CMD+r, or the Option/alt key to boot from the Restore partition & use Disk Utility from there to Repair the Disk, then Repair Permissions.
If that doesn't help Reinstall the OS.

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I think in this case, you may be best to speak with Microsoft about this, as it does seem like an issue with Office, and not your Mac.
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{ edited }

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