The Apple Genius Bar is an amazing service provided in most Apple Stores scattered throughout the country.
However, you will have to take the computer in to them, which is difficult for an iMac or other larger machine. They will only look at the Apple related issues, not other software, peripherals, any networking issues, email, website, cybersecurity etc. etc. related to your IT life and business.
Mac Smart can support you remotely, or onsite. We can deal with every IT issue related to your personal or business world, not just the Apple problems. We will hold your hand if required throughout the process to complete resolution.