Not for the faint of heart, you've been warned: so I've been working through issues with my homebrew computer. Finally figured out that the root of my problems was a bum motherboard (replaced the HD 4 times, thinking it was a bad model), so I replaced it with a new one (Asus M3A78-EMH).
Everything's fine and dandy, except that the sound doesn't work. Not like I have it muted by accident, not working in the sense that Windows doesn't think I have any audio devices. I uinstalled the drivers for the old motherboard, put all of the new stuff on, and Windows still doesn't detect the sound card functions of my motherboard. Not only that but when I try to install the HDMI driver (and I know I have HDMI, the two ports are on the back of the board) I get a "No driver supported for this driver package" message, so it won't even install. When I go to the "add/remove programs" function in the control panel it acknowledges the existence of my sound drivers, but it doesn't know about them anywhere else.
I've tried: downloading and installing the updated drivers from Asus' site, downloading and installing the general drivers from Realtek's site (sound installs fine but is invisible, HDMI driver gives me the same message, so exact same results as Asus' drivers), and crying a lot. Nothing's worked.
Do I need to reinstall Windows to wipe the old drivers that may not have uninstalled properly? Do I need to update the BIOS (always a risky proposition and I'm loathe to do it)? Do I need an exorcism?
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Is the new motherboard the exact same model as the one you replaced? If it is a different model, you should do a fresh install of Windows.