Recently while browsing I have noticed an occasional "clicking" sound going on in the background. Somewhat like when you are typing but not quite the same. I do remember years ago the same problem but I think it just stopped (different pc that time). I dontknow what it is and its really annoying.
Difficult to pin down noise as it is a laptop. Can you try to listen to which area it is coming from? As has been said it is prob Harddrive or a fan. You could check for dust and muck near the fan outlets.
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