What to do if your system is switch on then it restart and shutdown?

If your system powers on but then restarts and shuts down, first check for any loose connections, especially for the power supply and internal components. Overheating can also cause this issue, so ensure that fans are functioning and vents are not blocked. If the problem persists, boot into Safe Mode to troubleshoot software issues or consider running hardware diagnostics to identify potential failures. If you're unable to resolve it, seeking help from a professional technician might be necessary.