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Hi, welcome to JustAnswer! My name is***** am sorry for the trouble you are facing right now.But, I'll do my best to help you with your concern.
I know how frustrating it is for you, but in your case, your iMac might be experiencing some bugs due to reset. You can try to fix this by starting up from macOS Recovery. Please visit the link below and navigate to the highlighted text for more detailed instructions.
I am so sorry to hear that. Would you please try to power off your iMac, unplug the power cable for 5 minutes to reset the power, plug the cable back in then start your iMac?
To clarify, may I know if you are using an external monitor?
Okay. Would you mind trying again to press and holding the power button for 10 seconds? If the start-up window doesn't appear, please release the power button, then try to press and hold it again for 10 more seconds.
I just want to tell you that I am not related to any service provider, store, or account. Instead, you have reached JustAnswer, a network of experts that are willing to assist you with your problem.
Okay. If that's the case, the best suggestion is to contact Apple customer support to resolve the issue. You can reach them through this number, 1-***-***-****. I am sorry for the trouble you are facing right now. I know how frustrating it is for you, but I hope you understand the situation. Thank you for your patience.
Hello, it looks that you are unable to respond. I hope you are able to follow the instructions I provided you. I hope that works and is able to solve your problem. Please let me know if there is anything else I can do to assist you. Thank you very much.