I have 2 HDs - a maxtor 80GB and an IBM 60GXP 40GB. The Maxtor is currently the primary master and the IBM was the slave. I turned my computer off to change some LEDs and when I powered it back on it wouldn't detect either drive. I changed the LEDs back and still same problem, so I don't think the LEDs had anything to do with it. If I connect either drive to the cable but not both, they detect just fine. It's only when I put both of them on that I get trouble. Any ideas? I'm using an Asus a7m266, btw.