I understand that you're looking for help with your CPU. I'll do my best to assist you. When you say that the CPU fan is turning on but there is no display, it can indicate a few possible issues.
1. Check the connections: Make sure that all cables, including the power cable and display cables (such as HDMI, VGA, or DisplayPort), are securely connected to both the CPU and the monitor. Also, check if the monitor is powered on and set to the correct input source.
2. Reseat RAM and GPU: Remove and reseat the RAM modules and the graphics card (if you have one). Sometimes, poor connections can cause display issues. Ensure that they are properly seated in their respective slots.
3. Clear CMOS: Resetting the CMOS (Complementary Metal-Oxide-Semiconductor) can help resolve certain issues. To do this, locate the CMOS battery on the motherboard and remove it for a few minutes. Then, reinsert the battery and try turning on the CPU again.
4. Test with minimal hardware: Disconnect all unnecessary peripherals and leave only the essential components connected, such as the CPU, RAM, and GPU. By doing this, you can determine if any other hardware is causing the problem.
5. Check the power supply: Ensure that the power supply unit (PSU) is functioning properly. You can try using a different PSU or test your existing PSU on another system to verify its functionality.
If none of these steps resolve the issue, it may be helpful to consult with a professional technician or contact the manufacturer for further assistance.