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Question: iMac won't completely start-up

iMac (Retina 4K, 21.5-inch, Late 2015) running macOS 10.13.2. After a recent Microsoft software update and restart, the iMac would not complete the start-up sequence. The white horizontal scroll bar below the Apple logo, comes to a stop at the very end of its path. I've waited 10 or 15 minutes for the scroll to end and the start-up to complete, but no luck. I restarted the iMac (using its internal HD), but the incomplete start-up continues. Doing a start-up from my external back-up drive with a SuperDuper! back-up file works fine.

iMac, macOS Sierra (10.12.5)

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Mar 9, 2018 7:15 AM in response to wallacestuart In response to wallacestuart

Try holding the option key on startup to Startup Manager. Then choose your Mac OS volume and see if that works. If it does there's a problem with the Windows volume.

How to select a different startup disk - Apple Support

If that doesn't work then try an SMC reset:

How to reset the System Management Controller (SMC) on your Mac - Apple Support

Mar 9, 2018 7:15 AM

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Mar 9, 2018 8:45 AM in response to macjack In response to macjack

'Sorry about screen shot as a reply to your macjack comments. Apple doesn't let postings of original posters to be updated, so I inserted the image the best I could. I tried both of your suggestions, but neither worked to fully start the built-in drive on the iMac. More ideas?

Mar 9, 2018 8:45 AM

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Mar 9, 2018 10:54 AM in response to macjack In response to macjack

I have the same problem on my 2011 27 in, i7, 3.4 ghz 32 gbs of memory. Stuck on the white screen and I just bought this thing from a supposedly certified refurbished seller. I've combed the web and YouTube and it seems you have to bake your video card. My display is a mess as horizontal and vertical black and white lines going through it right before it crashed. it's not restarting, trying to boot it in Safe Mode Nothing is working, I just get a white screen. Ugh

Mar 9, 2018 10:54 AM

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Mar 9, 2018 9:51 PM in response to macjack In response to macjack

Yea, wasn't going to go that route lol. I sent it back today hopefully I will get it back sooner rather than later. This is my first Apple product. I hate windows I refuse to use it ever again so hopefully apple and I will work out.

Mar 9, 2018 9:51 PM

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Mar 10, 2018 1:43 PM in response to wallacestuart In response to wallacestuart

I opted to not start in Recovery Made and reinstall macOS. I'm not acquainted with Recovery Mode and feared trouble with installing a backup on the reinstalled macOS. I did attempt installing my Time Machine backup. I have never done this before. For some reason, Time Machine had 2 options for doing a complete install on the HD. In both cases, Time Machine chose the name of the HD of an iMac that I retired from use about 6 months ago. I skipped using Time Machine. I did restore my month old backup stored on a SuperDuper! partition of my external HD. It worked ... the HD in my iMac did startup completely! I lost more work stored on the iMac's HD than I'd hoped. However, the iMac has restarted successfully for the last few days and I am happy. Thank you macjack for your ideas, but I am now back at work using the backup reinstall that I didn't want to use.

Mar 10, 2018 1:43 PM

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Question: iMac won't completely start-up