A big question mark gray

Twice in the last few weeks, when I walked away from my iMac for a few minutes, I'll be back to see a big gray question mark on the screen.

The mouse is not a click or move, and the only way to get rid of the question marks is to reboot, that thin iMac.

Is this a sign that I need to replace my iMac? I would rather not still.

24-inch Mid 2007 10.9.5 system.

Thank you!

Looks like your Mac has restarted and couldn't find the startup disk. See on the screens you see when you start your Mac - Apple Support

Tags: Mac

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