[ubuntu] ubuntu installer doesn't detect hard disk

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http://ubuntuforums.org – hello , im pretty new on lynux and im having problems with the installation ,when i try to install the ubuntu it works all fine untill you need to choose in what hard drive you want to install it the problem is that the ubuntu does not detect any hard drives on my computer.... iv tried everything: change the bios setting replace the sata cabels and ports i was doing all fine but ubuntu just wont detect my hard disk something weird is that when i connect the computer to a usb hard drive the ubuntu detect it all fine pleas help im getting crazy !!!! my motherboard :gigabyte ga-b75m- (Hardware)