Hello! Based on the information you provided, it does sound like there may be an issue with your power supply unit (PSU). When your PC only turns on after removing all peripherals like the keyboard, mouse, and camera, it suggests that there could be an overload or short circuit causing the PSU to shut down for safety reasons.
Additionally, if the RGB lights on your fan are flickering or not functioning properly, it could be a sign of insufficient power or a fault in the power supply. RGB lights draw additional power, and if the PSU is unable to provide enough power, it may lead to issues like this.
Before replacing the power supply, you can try a few troubleshooting steps:
1. Check the power cables and connections to ensure they are secure and not damaged.
2. Test the PC with a different power outlet to rule out issues with the current outlet.
3. Remove any unnecessary components (like extra drives or cards) to reduce the power load on the PSU.
If after trying these steps the issue persists, it is likely that the power supply unit needs to be replaced. It's essential to choose a PSU with sufficient wattage and good quality to ensure stable power delivery to your PC components. If you're unsure about selecting a new PSU, feel free to provide more details about your PC's components, and I can help you with recommendations.