Why is my iMac Pro showing alternating slot diagrams on startup?

After vacation powered up Pro Mac display and wouldn’t take password so I restarted it and now getting two alternating diagrams. I tried recovery mode and safe mood. Nothing changes

[Re-Titled by Moderator]

Original Title: Start up has two alternating slot diagrams

iMac 27″, macOS 11.7

Posted on Oct 1, 2024 11:26 AM

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