I know there is a sound card in this p.c why does it not show one?
Device Manager error ?
Make sure speakers are not muted.
Make sure Windows Audio Service is set to Automatic & Started. (Run services.msc)
Download & save to your desktop, Audio drivers for your computer model and Operating System from your Computer MFG Site. (Do not Install yet)
Uninstall Audio Drivers in Device manager & Reboot.
When new hardware is detected, point to desktop for drivers.