Hello, Shangs71.
Welcome to Apple Support Communities.
It's my understanding that your iMac is stuck on the progress indicator which doesn't finish booting even after several hours of being left on. I may be able to help with this. I would first start by seeing if you can boot into safe mode. Here's a link just in case: Use safe mode to isolate issues with your Mac
Thank you for using Apple Support Communities.
Cheers!
Welcome to Apple Support Communities.
It's my understanding that your iMac is stuck on the progress indicator which doesn't finish booting even after several hours of being left on. I may be able to help with this. I would first start by seeing if you can boot into safe mode. Here's a link just in case: Use safe mode to isolate issues with your Mac
Keep us updated and we'll go from there.If an issue doesn't happen in safe mode
If an issue doesn't happen when your Mac is started in safe mode, try restarting without pressing any keys.
- If the issue comes back, you might have incompatible login items.
- If the issue doesn't come back, it was probably caused by a cache or directory issue with your startup disk, which safe mode fixed.
Thank you for using Apple Support Communities.
Cheers!