Why does my PC make a buzzing noise when I play a game?

If your PC is making an audible buzzing noise, it might signify that something is wrong with the internal hardware. A computer buzzing noise is due to obstructed case fans, loose screws & cables, damaged DVD/CD-ROM, failing hard disks, CPU overload, coil whine, or an overworked power supply.

Why is my computer making a weird buzzing noise?

By far one of the most common noises you’ll hear when using a desktop PC is the internal cooling fan inside the computer. This sounds a lot like a soft whirring noise. Much as the name suggests, this fan cools the internal hardware and central processing unit (CPU) and is there to prevent overheating.