The power supply unit (PSU) is vital for all desktop PCs. This component handles the conversion of power from alternate current (AC) to direct current (DC). Your PC parts can’t work with AC and require a stable, reliable DC supply that a power supply provides. Everything connects to the power supply, albeit some parts indirectly through the motherboard. Should your PSU encounter issues, buy a PSU from an unreputable brand, or overload it with more powerful parts, you risk causing irreparable damage. Thankfully, power supplies are designed so they shouldn’t go out with a bang. Here are some signs the PSU could be on its way out.