PCV-RX401 no sound - need yamaha ac-xg wdm audio driver update

[SalesXpert]

I have recently inherited a PCV-RX401 which is working fine apart from the lack of sound. understand that a Windows XP service update caused loss of sound on this machine. However I could still get left channel sound on my headphones but nothing from the either of the integrated speakers in the monitor. Following old advice on the web I downloaded and installed what I thought was the relevant update from www.devicedriversforfree.com. Now I have no sound at all. Can someone point me to the definitive software upgrade required to fix this annoying problem. There is nothing relevant on the Sony Support website for the PCV-RX401. Thank you.

[Blencogo · Accepted solution]

Hi SalesXpert and welcome.

The Original Preinstalled Drivers Package for the RX401 sold with XP preinstalled contains the original Yamaha driver but there is no update.

I presume you are still using XP.  Have you tried reinstalling this original sound driver?

You will need to download the Original Drivers Package as a .ZIP and Extract the files to a known directory.  You will then need to install the driver from within Device Manager using the 'Have Disc' method.