Thx a lot for helping me bertvandonk, it's people like you, that help others without expecting any benefit, that rock. I checked the "s2k slew rate control" in the bios and, guess what?, it was already set to 3. Damn I've tried to contact Asus technical service (I've sent E-mails to the United States, to Germany, to Holland and even to China!) but only the chinese have replied to me in a poor english but in a very thankful effort to try and solve my problem. If u have any idea of what else can be causing this problem I would really appreciate u to give me a hand.