iMac Power/Startup Problem

Thank you for the response.

I take it that this apparent hardware problem is one that I cannot remedy and that professional service is needed.

Indeed, after failing to restart the iMac myself, I did schedule a carry-in service appointment at a nearby Apple store for tomorrow, Jan. 16. Apple however cancelled the appointment today, Jan. 15, because the store is going to be closed and continue to be closed all next week. (The store is located just outside Washington, DC and the closure is probably due to concern over potential disturbances related to the upcoming presidential inauguration.)

Following the cancellation, I went online and tried to schedule a service appointment at other Apple stores and authorized service centers within a 25-mile radius of my home. Every location has no availability for at least 7 days. So I have little choice but to keep checking online for availability.

Thank you again for taking the time to respond, and I hope you are safe and well during this extraordinary time.

The only AASPs I've looked at are the ones Apple lists for carry-in service, in addition to its own stores. Like the Apple stores, the AASPs in my area have no scheduling availability for at least a week. My educated guess is that with so many people working from home due to the pandemic, operational computers are in high demand and so are repair services when the devices fail. I plan to continue to try to schedule carry-in service. In the meantime, as we have use of a MacBook, we're not entirely offline and computer deprived.

According to Apple, the problem with the iMac was a defective logic board, which Apple replaced. All seems well now.