The manual clearly states that the front panel header supports , not HD Audio. You will need to change your case’s audio cable from the "HD Audio" plug to the "AC’97" plug (if your case supports it) or manually re-route pins 1-10.
: Ensure the lever on the LGA775 socket is lifted. Align the notches on the processor with the socket keys and lower it gently. Close the load plate and secure the lever. Power Connections : Plug the 24-pin ATX main power cable and the 4-pin ATX_12V CPU power cable into their respective headers. Front Panel Headers acer socket lga775 pcie motherboard 915m08g8ks manual
Download Acer Support Drivers and Manuals | Acer United States The manual clearly states that the front panel
If you cannot find the PDF, here are the critical specs you need: Align the notches on the processor with the
A common challenge with Acer OEM boards is the front panel connector. For the 915M08 and similar Foxconn-based Acer boards, the 14-pin header (often with pin 9 or 10 missing) typically follows this layout: Pin 1 is Positive (+), Pin 3 is Negative (-) 2 & 4 Pin 2 is Positive (+), Pin 4 is Negative (-) 6 & 8 Power Switch Orientation does not matter for the switch 5 & 7 Reset Switch (If present; orientation does not matter) 12 & 14 Used on some server/workstation models Installation & Troubleshooting Tips Acer Socket LGA775 PCI-E Motherboard 915M08-G-8KS