Describe the sound and timing
Record whether noise occurs at startup, under load or continuously. Airflow, rattles, coil noise and mechanical-drive sounds have different possible causes; a recording may help support investigate.
Be cautious with possible drive damage
If unusual mechanical sounds accompany file errors or an unreadable drive, stop repeated use and discuss data recovery first. Do not run repeated scans or promise that copying files will be safe on a failing drive.
Check external conditions
Keep vents clear and note recent movement or installation work. Do not put fingers or objects near running fans. Internal inspection and cable checks should follow the machine's service instructions.
Stop for safety symptoms
Smoke, electrical smells, severe heat or sparks call for stopping use rather than continued testing. A noise alone does not prove an inexpensive fan fault, and opening a power supply is not a safe home check.
Questions about this guide
What should I note about a new computer noise?
Record where it seems to come from, whether it changes under load and when it started. A recording can help describe it, but does not replace checking the machine.
Is every clicking noise a failing hard drive?
No. Fans and other components can also make noises. If important files are at risk, avoid repeated experiments and describe the storage type and symptoms before choosing a next step.