My laptop randomly shut off and now it won't turn back on?

What's wrong with it? Do I have to buy a new one? I'm so confused.

P.S. I'm typing this from my iPhone.

Added (1). I took the battery out and now it's working again. Yea! If I put the battery back in though, will it still work?

Hold the power button down longer. Sometimes they take a few seconds.

Repair it

Unplug your laptop.remove the battery from it if you can then hold down the power button for 30 seconds to remove any static charge.

Then insert the battery in again and then try to switch it on.

If it still doesn't work take it to a service center

You should provide more info. Did you notice any overheating? Does it start at all? There definitely must be some reason that you laptop shut off. It might be:
2) Faulty hardware (e.g.a damaged PSU, most likely)
1) A virus (least likely)

If your computer isn't turning on at all, you should try a different PSU as your PSU might have failed. But I suggest that you get your computer to a professional. If you have a damaged hardware component, the only thing you can do is replacement or repair(if possible).

I think the battery of your display not fully charge.

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