My computer hard crashes and makes a buzzing sound until I long press power button, what do I do?

[Microsoft Windows]

Hello, I cleaned out my PC after taking these components out, RAM, the GPU and Fans. After re-slotting everything, I've experienced hard crashes since doing so. I've taken the opportunity to re-slot everything, and it still happens occasionally. I spend about 9 hours a day gaming and spending time on YouTube, my computer will crash 1-2 times in this time, and the screen will freeze, and any noise currently playing will be stuck making a loud buzzing noise. I've looked at other queries similar to mine and you guys have recommended that I do a driver check and file check, which I have done and i

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