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Helpful answers
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Jan 26, 2016 8:27 AM in response to crummerby rkaufmann87,In About the screens you see when your Mac starts up - Apple Support it advises that symbol indicates the computer cannot find a valid System Folder to startup from. What I would recommend is a couple of things, first is System Preferences - Startup Disk verify that your internal drive is selected. If it is not, select and then restart and test.
Post back with the results, it also could be something else.
Of course, as usual please ensure you have a full backup of your internal drive. Either a Time Machine or bootable clone backup is fine.
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Jan 26, 2016 9:34 AM in response to rkaufmann87by crummer,Yeah, I found that article before.
I seem to be getting the screen at a point when I haven't restarted, though. It just happens at some point during the night while the computer is asleep. I am at work right now, so I cant check if the start-up disk is selected, I'll do that when I get home.
I am not sure why turning the iMac off via the button on the back and then back on again would start normally if it were missing a System Folder or something.
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Jan 26, 2016 9:41 AM in response to crummerby rkaufmann87,
Okay,Once you have gotten home to check the startup disk, post back with your results.
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Jan 28, 2016 7:53 PM in response to rkaufmann87by crummer,I made sure that the startup disk was set to Macintosh HD. Also tried resetting SMC.
Today I got a similar but different issue (first time having an issue since last post). Today the screen was entirely black no symbol on it. The back light was still on. Had to do a hard reset to get it to come back still.