I fried a mother board somehow I hooked up a HD4890 to a 32bit pentium board and when I couldn't load the drivers I shut down and swaped back to the HD4650 and then I started getting four tones high pitch, low pitch, high pitch, low pitch then shutdown. the board is from a gatway 506gr. I've got a new board and all the fixins minus processor that comes next week. I didn't want to throw the old board away so if these tones tell you somthing please share.
