I have a toshiba satellite m100 when i plug in the power supply and listen to music out of the headphone jack there is a loud buzzing noise. and when i disconect the power supply and run on the battery there is no noise what may be the problem
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An easy step that you can take is to try to reinstall the drivers. Something may be conflicting with them which causes this effect. The other option is that the hardware may be failing. Here is the driver page for your Toshiba laptop. Hopefully it is as simple as the drivers just needing an update!
Two possible causes one is the headphone jack and the other a driver issue.
The headphone jack has a metal leg that is pushed out of the way when you insert the plug. It then switches from speakers to the jack. That's how it is supposed to work. The third leg can get dirty or bent or loose and not switch correctly. If it is dirty you can sometimes clean it just by inserting it and pulling it out a "few" times. If it is mechanical ie loose then it needs to be replaced which means replacing the main motherboard. You can check for warranty but from experience it might just be one of those things to get used to instead of trying to get them to replace a main board.
If it is a driver all you can do is hope they update the drivers. You can check the drivers versions and release dates on the Toshiba website. Just go to www.toshiba.com then support then laptop and then find your model. Drivers and sort by your operating system. Unfortunately Toshiba seems to have a history of unresolved sound card driver issues.
Your having a problem with the dc jack on your motherboard. What needs to happen is the motherboard needs to be taken out and there will be solder points underneath the dc jack on the motherboard.
These solder points need to be resoldered so that way the dc jack stays in place properly.
At this point you should be able to hook up your ac adaptor and use your laptop that way.
I think you are on the right track, if the headphone jack is worn and shorting out itll kill the speakers because it thinks headphones are plgged in, ebay would be a good start for parts, maybe even call toshiba and speak to their tech support.
Is there a switch to turn on the headphone port? Is there a control on the headphones to adjust the volume (on a volume level on the side of the laptop)? Also, when the headphones are plugged into the laptop, go into your sound settings and turn up the master volume (and wave volume if it is low.. If that works, make sure to turn it back down when disconnecting the headphones).
Also, do the headphones work in another device (stereo, etc..)?