The "SM Bus Controller" error on your ASUS PC is rarely a sign of hardware failure. It is simply a communication gap between your motherboard and Windows. By installing the correct directly from the ASUS support site, you can clear that yellow exclamation mark and ensure your system’s power management is running at peak performance.
If you have an Intel-based ASUS system and finding the specific ASUS page is proving difficult, Intel has a tool that automates the process. sm bus controller asus