Chosen Solution
I know there’s a way to silence the startup chime. If you’re knowledgeable and familiar with TERMINAL. As a test I deliberately gave it something to beep at for an error. No memory got a beep but the three lights stayed lit. The USB ports weren’t polled (I’ve a Flash Drive with a red LED to indicate use. No keyboard, no error response. Seems to point to a bad display subsystem. I checked all the cables and they’re all properly connected except the mic/camera. I’m open to all insights.
There is not much I can offer here with the limited info you have. Frankly, this will need someone with deep logic board diagnostic skills to troubleshoot its not easy and might be more costly than getting a replacement logic board. Then the question is… Is this worth keeping?? Given the systems limitations it might be cheaper and easier just to find a used newer system which is working!
