Originally Posted by Mikael Andersson;[URL="tel:3834768"
3834768[/URL]]Interesting, this was new information for me.
As i pull out the cord and reconnect it, the sound will appear in both channels.
I this a headset problem or is it my laptop?
This does not sound like an issue with your headphones, but Renoktation mentioned it is more likely an issue with the connectors within the jack itself.
You mentioned
Sometimes, there is sound when i restart the laptop. But the sound will disappear after a short while.
if it sounded like a low hum, it was most likely due to a short in the headphone jack itself with the sound going away once the charge that built up in the short dissipated.
Super easy to test yourself. If you look at the plug on your headphones you will see the metal is separated by black bands - these are the separations of the left and right channel signals which little tabs inside the jack press against. If you pull the plug partway out of the jack you may hit a connection for each channel. But the easiest way to test is try another set of headphones. If the problem happens with those too - then the issue is with the jack on the computer. Done. You can either get it serviced at that point, or (again as Renoktation mentioned) buy the new jack and solder it in yourself if you are good with a soldering iron.
Try another set of headphones and see if the issue happens again or not. Mystery solved.