Chosen Solution
I have no idea what else to say about the problem I’m having other than besides the faint beeping, the computer shows NO signs of life at all. No fans, nothing at all. I don’t know if this is noteworthy, but it’s bootcamped with Windows 10, and lately if I’m using Windows and put the computer into sleep mode, when I come back to it, it won’t wake up and forces me to hard restart it. That problem started occuring about two weeks ago. Here’s a video I recorded to demonstrate the beeping: https://youtu.be/uAFVe4LmR8A
Beeping usually indicates bad RAM, and not waking up from sleep sounds like it could be caused by that as well. In order to access the RAM you need to take off the screen and access the logic board. Booting to Apple Diagnostics might be able to help diagnose the issue. If you still have AppleCare you might want to have Apple check it out, as opening it will void any warranty it does have.