GXDeMoNN, I have a couple of suggestions. More recently, in December, 2006, I assembled a desktop computer using a 120-GB hard disk drive(SATA-2) and an Asus AV-8N motherboard. This worked quite well with Windows XP-SP2, Pro and Ubuntu Linux(vers. 6.10, 7.04 and 7.10).
One possibility would be to try the latest version of Ubuntu Linux, version 7.10. Since it can be downloaded for free, the price is certainly right. Sadly, SATA is a pretty new technology and if your motherboard has an older and incompatible implementation of that standard, then that might the problem right there. Can you download a newer SATA driver for your motherboard from its manufacturer's website?
Be sure to post if any of these suggestions help.