Chosen Solution
Hi! I’m working on a customer’s iMac 2019 for a no-power issue. She stated it was rarely used for the first year and a half she had it and just recently started using it for remote work. I can’t imagine that she could have done anything to it to cause an issue. She even had the original box, foam, dust cover, everything. One day, she went to turn it on, and nothing happened. No fans, no chime, just a bit of an initial whine from the PSU capacitors when it’s plugged in. After checking the diagnostic LED’s on the logic board, only LED #2 is lit. LED 1 would indicate trickle power and LED 1 + LED 2 would indicate the system is on and receiving enough power. Never, though, have I only seen LED 2 on with LED 1 off. I checked the diagnostic guide for this iMac and nothing in the troubleshooting section says anything about an LED being on “out of sequence” of the prior prerequisite LED’s. What I’ve tried so far: Different working power cableDifferent wall outlets (both at client’s location and mine)Checked power button cablePRAM battery OK @ 2.8VRTC clock reset (because why not, at this point.) Any ideas?
Here’s a useful reference on your systems diagnostics LED’s! Diagnostic LEDs and Test Pads for iMac (Retina 5K, 27-inch, 2019). Apple in a very rare moment produced a repair guide for this system! iMac 27" 5K (2019) Repair Manual Sadly, it’s not a full depth Technician Guide missing the needed info to diagnose things. Even still its useful!
I had the same problem and fixed it finally. For me, I found that one of my CPU pins was bended after checking all the components. I fixed the CPU pins problem and my iMac was work again.
