Try clear cmos and load defaults after flash..If still no activation, could you post a acpiscope report, or even an everest report may enlighten. Do/did you have any softmods or loaders before..they must be COMPLETELY removed.. How did the flash go?? Any errors or other?? With a report it will be easier to give answer, try to clear cmos and defaults first..
Manufacturer: Gigabyte Model: EX58-Extreme rev 1.0 BIOS: Award Version: F3 Flashed and activated without a hitch. Thank you so much!!! 911 Medic!