First, troubleshoot:

• Software stress: Close demanding programs and unnecessary browser tabs. Check running processes in Task Manager (Windows) or Activity Monitor (Mac) and end anything hogging resources.
• Overheating: Monitor your CPU temperature with software like Core Temp. High temps make fans work harder, so if it's scorching, adjust your computer's power settings, close demanding tasks, or even clean cooling vents for better airflow.
• Hardware hiccups: Check for loose cables or debris blocking intake vents. If your laptop sits on a soft surface, elevate it for better air circulation.

Next, clean those dusty blades:

• Turn off and unplug your computer. Safety first!
• Open the case (desktops) or use compressed air on vents (laptops). Dust buildup is a major culprit. Blast compressed air in short bursts to avoid damaging delicate components.
• Carefully remove the fan (advanced users only). Clean the blades and surrounding area with a soft brush and compressed air. Avoid touching the delicate wiring.

Last, consider these options:

• Fan control software: Programs like SpeedFan allow adjusting fan speeds for a quieter balance.
• Fan replacement: If cleaning doesn't help, a worn-out fan might need replacing. Choose one compatible with your model and specs.