When a MacBook refuses to turn on, won't wake from sleep, or exhibits strange battery behaviors, the first and most effective diagnostic step is resetting the System Management Controller (SMC) and Non-Volatile Random-Access Memory (NVRAM / PRAM).
Because Apple has transitioned from older Intel processors to the T2 Security Chip, and now to custom Apple Silicon (M1, M2, M3), the reset process is vastly different depending on the Mac you own.
Use this interactive troubleshooter to accurately identify your Mac's architecture and execute the exact sequence required to revive your machine.