My "sony vaio vgn txn15p"

What operating system do you have on the Vaio? Check if there is some options in Control Panel - Sound menu...

How do you know it is not a battery problem? It seems obvious that the charger is working as the message you get tells you it is getting power to the laptop. So it looks like the solution is to get a new battery, also indicated by the fact that you can't boot with the battery in.

Then you have a faulty Power Inverter.. You need to replace the power inverter below the screen... it is the Long rectangular Circuit board - it is what the lcd wires/plug plugs into.. it converts the DC power going through your laptop back to AC Power to Be able to power the bulb..They average $12 to $30 on Ebay for replacement... just unplug from both ends ( display cable plug and lcd bulb plug ) When Searching on Ebay... type : sony vaio vgn-tx power inverter

i believe it is a charger issue not a battery issue replace your charger

Hi,
The best thing you can try is a Static discharge.
Please remove all the external devices. Unplug the power adaptor.Remove the battery. There should be no electricity connected.
Then press the power button and keep your finger on it for about 30 seconds to release any build up electricity.
Plug in the adaptor and battery again and see if there is still a problem.
Maybe is a good idea to get a surge protector in the future.
Regards,
Purito

sometimes you need to uninstall first then reinstall try it may work

You will need the drivers for the drive. When you look at the devices in device manager (devmgmt.msc) do you see any drives under DVD/CD-ROM drives?

Visit support site and download latest network driver for your model.

check adapter output also may be problem with dc socket on laptop loose or somthing.