Every PC needs a PSU in order to operate, and it’s not just about giving the PC a way to plug into the wall outlet. If your computer frequently crashes or shuts down without any apparent reason (especially if it doesn’t display the “blue screen of death” or BDoS on Windows systems that report operating system crashes), it could be a sign of an insufficient power supply. There are also some physical signs to look out for, including unusual noises like buzzing, clicking, or whining coming from the PSU, or the presence of a burning smell, which could suggest a malfunctioning or overloaded power supply