T400 speakers not working - headphone jack functional?!?

That happened some weeks ago, no software or hardware changes were made prior to speakers gone mute. The other day however speakers were back from malfunction and operative again 100% - for no apparent reason, but as soon i plugged headphone jack in and out - they were gone again!?!? Is there a catch or something that i'm doing wrong!?!? I've tried: removing and reinstalling sound card drivers (no success), different OS (no success), checked headphone jack for foreign objects (found nothing, it looks ok in comparison to other jack (microphone)). No warranty on this machine (expired). Any suggestions??? Thanks in advance.

Hi jeronomije,
Welcome to the forum,
please get in touch with the Contact support team with the below details
Note: Customers in some areas may need to incur some charges when calling the numbers below. We cannot guarantee that this information is up to date since rates and calling plans of telephone operators may vary significantly over time.
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