I have the same problems (at least the same symptoms). Do you have an ASUS Mainboard? I already posted a thread about this: http://www.nvnews.net/vbulletin/showthread.php?t=69617
There is another one about the same problem http://www.nvnews.net/vbulletin/show...=1#post1214554
Seems like this has not been solved up to now...