I am not a computer person but we did install a new Radeon hd 4650 video card in my son's hp. The Best Buy Geeks looked it up for our model and said it was compatible. We put in a new power supply. The picture works but no sound. Doesn't recognize the speakers at all. Says nothing is plugged in and there is no volume bar at all. We did updates on drivers and don't know how to take it all apart and redo it. Why is there no sound now? When we check device manager it says ati is our audio driver. So we can't figure out how it isn't working.

Are your speakers plugged into the 3.5 mm jack on the system?

When you install the Radeon driver, it can sometimes change the default audio output to the HDMI port on the video card. For various Windows OS versions, you need to set this in the audio section of the Control Panel. The specifics may vary. For versions before Windows 10, Click on Start and select the Control Panel. Then choose the Hardware section. Find the Sound section and Manage Audio Devices. In the Playback tab, right click on the correct audio device (Speakers) and select Set as Default Device. Depending on the system, you'll probably see AMD HDMI Output and Digital Output. For Windows 10 before the Creator Update, right click on Start and look for the Control Panel. After the Creator Update, you'll need to click on Start and expand the Windows System folder.

I hope this helps.

Cindy Wells