Solution without audio equipment: 1. Right-click My Computer-Properties-Hardware-Device Manager. Expand the sound, video and game controllers to see if there is a yellow "?" In front of them. No, yes, it means the sound card driver is missing. If there is a yellow "!" No indicates that the sound card driver can't be used normally, uninstall yellow! Number of sound card drivers. Replace the sound card driver with Driver Life or Driver Wizard, or start to run dxdiag—-sound, check the sound card model, and download and install the same sound card online. Right-click My Computer-Manage-Services and Applications-Serve windows Audio-Set to Automatic-OK. The sound card is disabled and enters the BIOS program. Then check whether the peripheral option in the BIOS is set to "disabled", and if so, just change it to "enabled". If I set this item to "Enable", it may be that the motherboard sound card circuit is damaged, so just repair the sound card circuit. If the sound card driver has been installed and there is still no sound, then clean up the dust on the sound card slot and sound card of the motherboard (especially check whether the golden finger is moldy, etc.). ), clean, and then reinstall, general fault can be ruled out. Uaa patch is missing, which means there is yellow on the front of PCI device! No. Start-Control Panel-Sound and Audio Devices-Sound, check whether it is muted and then select Window as the default; First, run regedit to open the registry, find "HKEY _ local _ machine \ software \ Microsoft \ Windows NT \ current version \ DriverS32 \ terminal server \ RDP", and check whether there is "wavemapper" in the right window. If not, use the data of "msacm32.drv" to create a new string value "wavemapper".