The last possible problem is system setup.Right click the volume icon on the taskbar to select a playback device, and confirm whether the default device points to other non NVIDIA options.If not, change to the correct sound output source and ensure that all relevant settings are enabled.If the above methods have been tried and still fail, it is recommended to find a professional to check the hardware connection or consider repairing and replacing a new sound card
Another solution is to enter the control panel ->System and Security ->Hardware and Sound ->Device Manager, find the sound, video and game controller, and see if there is a yellow exclamation mark or question mark?If yes, try to uninstall and reinstall the NVIDIA sound card driver
Try this: First, make sure your sound card driver is up to date.Go to the NVIDIA official website to download and install the HD audio driver for WIN7, and then restart the computer to see if the problem is solved.If it still fails, check whether there are disabled or conflicting devices in the device manager. You may need to update or reinstall them manually
ZOL Q&A>sound card>system>Mobile phone installation>NVIDIA High Definition Audio sound card cannot be used under WIN7. The sound shows a small red X, and it also says that no audio device is installed
