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I would guess there is a fault with with the earphone jack socket, the soldering to the printed circuit board or perhaps some of the electronic components that might or might not provide attenuation and/or tone correction for the earphones.
Probably be a cheaper cure to use bluetooth.
I use a usb FM transmitter so my sound files can be played on any nearby FM radio.
You will need professional help on this, the laptop must be dismantled down to the motherboard level to access the problem. The earphone jack may have to be replaced and requires a high degree of solder skills to remedy the situation.
Well, you need to find out what happened. Normally, the earphones will cancel the internal speakers, but the function of the speakers should return after you remove the earphones. What you need to do is go into the control panel and then to the sounds icon and find out what the system is using for its output. It could be that it thinks the sound should be still going to the earphones. If so, change it to speakers.
go to the windows start button - control panel - sound.
Then take a look a the settings, with the earphones plugged in and out.
Maybe, you have to deactivate the normal sound system, while the earphones are plugged in.
Or maybe you see some settings there to control the outgoing sound.
Brieftly speaking, my internal speaker stopped producing sound, but when I plug earphones in, there is sound in the earphones.
Just plug in-and-out ur earphones several times (it took me 5 tries) and voila internal speakers work again!
I think there is a mechanical sensor inside the sound output (plug for the earphone) so that once it senses a plug getting in, it shuts internal speaker.
Maybe the mechanical sensor was jammed (spring problem i guess) and it still believe that u have ur earphones plugged-in. "Clogging" the hole for the earphones would allow the spring to spring back to initial position...
It's probably _not_ the soundcard (chipset), but the teeny little crummy speakers built into the T42. On a thin, light laptop the manufacturers have to make some compromises, and one of them is that they give you miniature speakers that aren't much good for music reproduction.
The fix: either uses earphones or plug in external speakers into the earphone jack. You can get pretty good, pretty cheap external speakers that give you fine sound.