Good day,

I have problem with speakers. They fail sometimes at start windows logon screen, at start browser. I have tried to many combinations - reinstall PC and install drivers in order, driver from Microsoft but 6.2 version, uninstall drivers from Windows, distable drivers for example NVIDIA, ... etc. , automatic repair tools, but no one tool or process hasnt repaired this problem. Sometimes it is working good but many times. 75 % it is broken and i dont know what to do now. Im using headspeakers to challenge with it. With speakers, headspeakers, or others additionals it is working correctly. I havent tried to restore it to factory build becouse i dont have this ability anymore. 

Im using OS Windows 7.

Any suggestions would help.