This one deserves caution:

• Read/write head issues or power instability can cause clicking.
• Failing HDD firmware or bad sectors causing repeated retries.
• Loose or damaged SATA/power cables.

Back up first if it still reads. Continued use can make recovery harder.

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What it might be (likely causes)

• Head seek/retry loop
  The actuator clicks as it repeatedly tries (and fails) to lock onto tracks. This is classic dying‑HDD behavior. Background: Hard disk drive failure, Head crash