Chosen Solution
My iMac is not starting up with beeping sounds (every 5 seconds) and a black screen. I checked the memory modules & slots as well as put in another set of working memory. However it is same. Do I have to disassemble & change the power supply or what problem on this iMac? Please advise me if you have experienced this case. Thank you Update (04/30/2019) Please see attached photos & movie. Thanks.
Here’s a good write up on the Beeps (Tones) The different Mac startup tones and the problems they indicate and here’s the Apple T/N on Tones About Mac startup tones Are you sure you’ve installed the SODIMM’s correctly? Can you give us a bit more on what happened at the start. Was the system working and then stop? Are you using a surge suppressor or a UPS? Did your power get a disruption or did you have a lightning storm?
