The system unit started making noise, and sometimes even sparked when turned on, which looked very dangerous. I took it straight to the repair shop. They conducted a free diagnostic here and said that the power supply had already outlived its usefulness and it was better to replace it. I agreed because safety is the most important thing. The repair didn't take long, and it turned out to be cheaper than I expected. Now the computer is running quietly, there is no spark, and I have been given a warranty card. I feel much calmer.