Digital Out activated when regular headphones plugged in.

Hi, guys.
I've been fiddling with this for a couple days now.
When I plug regular headphones or speakers into my MacBooks jack, the systems goes into Digital Out mode and thus, no sound can be heard from the headphones. If I plug them out, the internal speakers go back on and sound is back to normal.
After a lot of researching, I found a common issue, where the microswitch inside the audio jack would get stuck, and therefore the digital audio would always be active, even without anything plugged in. I don't think this is the same issue, since the system DOES KNOW when the jack is free, since I can easily switch back to internal speakers by plugging out. That's why I don't think the microswitch is stuck in my case.
I've noticed the red light turns on when headphones are plugged in. Somehow, it thinks any plug is a digital audio plug.
At this point, I've tried:
SMC reset
Wiggling a toothpick inside the audio jack
Deleting some audio plist files in my preferences folder
MIDI Audio configuration
Any tip will be preciated. I'm not in the mood to send it to have the motherboard replaced.
Thanks a lot for any hints!

Thanks. I already tried that twice, but didn't work.

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The E531 has one headphone jack, however it's apparently intended use is for headSETS ('phones/mic combo). Currently, my only interest for the port is standard headphones. However, there is an issue: when a pair of standard headphones are plugged in, the built-in mic is disabled so the mic on a headset can be used.
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There is definitely something strange here. I tried to reproduce your issue and if I plug headphones or headset I can still switch the microphone and speakers under Control Panel>Sound.
Have you got the latest sound card drivers?
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One day the building I've stayed been struck by lighting and my laptop suddenly shutdown. When I turned it back on the problem occurs. My laptop speaker wouldn't mute when the headphone plugged in. I've try reinstall the driver and plugged in a new headphone still wouldn't mute and the sound from headphone only from one side. Is this hardware problem and can it be fix or this problem can be solve just by tweaking?
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Message Edited by lantern on 03-28-2009 02:38 AM

Hello ricky_waldron,
Your speakers do not mute when headphones are connected.
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Last edited by Erus_Iluvatar (2010-09-15 09:41:56)

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Digital Out activated when regular headphones plugged in.

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