PC keeps making a buzzing noise and shutting off

[ShinyMew130 ShinyMew130]

When i open my PC the computer keeps making a buzzing noise, and after like 3-7 minutes it shuts downI can boot it up again after but it keeps shutting down. The sound usually intensifies when its about to shut down without warning.I cant really do much since im not good at tech. Guess it isnt too much of a big deal, might make my grades higher but when i need it for future use, i cant use it due to it shutting down.Please give an explanation and how to fix it.

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