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So now, I can just go back and forth, to/away from the PC, and the sounds goes on and of.. I guess it is something about static electricity from my body?

Static electricity event from your body is definitely the last thing I would explore.

A broken wire, loose plug, or faulty connection is the starting place.
Do both speakers share a stereo plug connected to the computer that separates into two individual cables?
I would start by pushing/stretching every section of the cable on the faulty speaker side to see if you can identify a broken conductor.
Unplug and re-plug the connection from the computer.
Shake the speaker, turn it upside down etc.
Most likely this will be a mechanical connection issue.

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