I've read a lot of threads on this forum already by people who've had similar problems to this, but frustratingly enough none of the solutions that helped them seem to have fixed my issue. I have a new install of Windows 7 (OEM Home Premium). The PC formally was used for Windows XP. The hard drive became corrupted and I figured if I was going to replace the HD anyways, I may as well upgrade to Windows 7. Under XP I had no issues with the on board sound card. The install went very smoothly except for the sound. The Playback Devices screen only lists Digital Audio (HDMI) and Digital Audio (S/PDIF) as possible devices. I'm trying to enable ordinary speakers. I downloaded the Win7 version of the the ATI Hight Def Audio Device drivers (I was using the XP version before the corruption issue). They appear to install fine but after the reboot, there is no sign of the drivers anywhere. Any new directions to investigate or suggestions as to the cause would be highly appreciated. Thanks in advance.