how to find out which macOS my computer is using if i can't turn it on

refikat65 Said:

"how to find out which macOS my computer is using if i can't turn it on"

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Finding the macOS on Another Device:

A. Go Here: Check your Apple ID device list to find where you're signed in - Apple Support

B. View On your iPhone:

If you have an iPhone associated to the same Apple ID, perform the following on the iPhone...

1. Go to: Settings
2. Tap: your name (top item)
3. Scroll Down: the page
4. Tap: your Mac
5. View: the version

refikat65 Said:

"how to find out which macOS my computer is using if i can't turn it on"

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Look on a Service Invoice:

Did you recently get this Mac serviced? If so, then it would be mentioned on the invoice.

refikat65 Said:

"Thank you for the kindness of your reply!"

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You are welcome.

Any success? I am eager to know.