973 iPhone_iPad_Mac_apple

whats a blinking question mark,

I tried all suggested ways to restart my MacPro Air, but it seems my start up disk is not being detected?

Hi,

That is correct, a viable OS cannot be found. Try booting with the command option and r keys held down.

Given you appear to have at least one other device to help resolve

this issue, there are details in the Apple Support article to consider:

An ability to bring up a 'recovery version' of macOS Utilities is there.

In any event...

Good luck & happy computing!

最后更新：2017-08-22 03:41:54