MacBook turns off on its own but when booted back resumes from where things were left.

vilvanesh wrote:

There has been discussions and solutions to a slightly similar case where the screen goes black suddenly(keyboard back lights still on), fans go crazy for few seconds and then macbook shuts down. But my case is different. All of a sudden the screen turns off(it's different from "going black"), keyboard back lights go off, the trackpad won't work(there is no feedback/click feel). But when I boot up: sometimes even before the bar below apple logo gets filled, it turns off again. But if it does complete the booting process, I see everything where it was left.

If your Mac spontaneously restarts or displays a message ...

vilvanesh wrote:

What's weird is that this " turn off process " can't be technically termed as a "shut down" because if a MacBook is shut down, all the applications are closed before powering off and they don't simply pop up when powered on(when no app is selected as a login item).

Some years ago, I think it was around El Capitan Apple added the feature that applications open with documents loaded when your computer is restarted. Look under the General tab of System Preferences at the Close windows when quitting an app. See this article: Automatically re-open windows, apps, and documents on your Mac - Apple Support

Unfortunately I can't give you any answers about your shutdown problem. There are a number of things that can cause a sudden shutdown including thermal fault, loss of power, and short circuit. If the battery is healthy the likely solution is a logic board replacement.

• Does this happen with and without the Power Adapter connected?
• Can you check System Preferences -> Energy Saver settings?
• Are there any external peripherals connected to the Mac?
• Log Out has the ability to save Application State and boot back into the last such state.