Onboard audio not working with new graphics card

[swisscheese]

Here is my issue,

I have 2 home built pc's. They both worked perfectly fine until I did the following:

1) I switched the graphics cards on both pc's
2) I uninstalled the old drivers (on both pcs) of the previous graphics card.
3) I installed the new drivers (on both pcs) accordingly for each graphics card.

Problem: Both computers are facing the same issue being that the onboard audio does not work.

Note:

1) Audio worked fine before I did the switch.
2) I set the stereo speakers to default in control panel> sound devices.
3) There is no enable feature for onboard audio in my BIOS for both mobos.


----------------------------
My PC#1 specs are:
GIGABYTE GA-EP45-UD3R 775 W/ INTEL C2D E8400
XFX RADEON HD 5770

My PC#2 specs are:
GIGABYTE GA-P55A-UD3 1156 W/ CORE I5 750
XFX GeForce GTX 260



let me know if my information is adequate.

 

[fleakiller]

Check your sound settings in windows for PC1 ati will set sound card hdmi as default as for the gtx it might do the same but not sure