Age of the power supply unit year. Installed with the cooler down (in agreement with the manufacturer's representative). System unit on the i5 8400 without a video card. Works in the semi-passive mode of the cooler. Recently, when starting the cooler, you can hear a rattling (shuddering) after which, it happens at low speeds, several times a minute, during light office work. If the cooler rotates constantly, there are no extraneous sounds. Service center in another city. Repairs under the warranty will take a couple of weeks, do not give a replacement. Tell me, please, is it something serious or just the mounting of the cooler? Can simply on their own disassemble and lubricate or replace Euler entirely in extreme case?