My laptop keeps shutting down unexpectedly?

It might be a heat problem in your laptop.

My friend had a similar problem.Hence he started keeping his laptop on something or you can use a stand by which air can pass through the lower part of your laptop so that it doesn't get overheated.If this doesn't work then format your Laptop.

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Operating system is damaged.... you must reload windows, avoid repairing of system while reloading options... ensure genuine system.

Generally this causes due to online games. Because games have their own operating system and so while playing games on net, your system have to tackle 3 operating systems , one your own another the NET server and the third game system.

In same situation always select safe mode for booting so that system may not damaged further. Every time you boot the system in this case, it create a temp. file, which further consume disk space and makes the system slower.

Most likely it is overheating, get a cooling pad. The noise you are hearing is probably the fan

My suspicion is that the hard drive is failing.

it could be a number of causes like a hardrive problem or a virus or even it could be getting too hot. make sure it is not on a bed and also make sure its on a flat surface

HOPE I HELPED YOU!!!