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First off, what bios are you using? Are you using a original BIOS, the unlocked Acer BIOS, or the ABIT BIOS?
As for the front audio problem, it's the new casing's fault. The Acer T180 (as well as all current motherboards) has an HDA-type front panel header, while a number of aftermarket casings are still equipped with the older AC97-type front panel. Using the AC97 panel on the HDA header will result in what you're experiencing right now. Sadly, there is no fix aside from getting an HDA-type panel.
You can try transplanting the front panel from the Acer casing to the new one if you're desperate though.