External speaker run but inbuilt speaker can not run
The connection of speakers may be loosen or the audio circuit gone faulty
SOURCE: can't mute inbuilt speakers
That is not a software problem.
The headphones/external speakers jack socket has a switch to exclude from audio the internal speakers, when a jack plug is connected.
This is a very simple device and is not software controlled.
The fact that it has gone faulty at the same time you reinstalled the system is a coincidence.
If it does not mute when you insert headphones, all you can do is trying to play with the jack plug , inserting and pulling it out. If this does not unlock the switch, the alternative is having the jack socket replaced by a technician. This is generally an expensive repair, asthe socked is soldered on motherboard.
A cheap alternative to a proper repair is using an external USB to Audio Adapter and mute the internal audicard when using headphones.
Try the following steps:
Open your laptop carefully (look out for fragile ribbon cables) !
Check for a broken wire going to the internal speaker.
Check for a faulty contact at the audio output jack (these things have a contact which disconnects the internal speaker when a plug is connected).
Temporarily connect any speaker in the place of the internal speaker.
If the problem is still the internal speaker, remove it and go to any good audio components shop and buy an equivalent speaker.
Hope this helps.
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