Building a system with an ECS MB P41.6g 256mb and a 40gb IBM drive. When I first got everything assembled and tried to fire it up, the fans started for a split second then everything stopped. I know sounds almost like the processor. So I started unhooking things one by one and have determined that when the hd is connected to a power lead it kills the system. If I leave the hd disconnected I can boot to either the floppy or cd-rom.
I don't believe it's the IDE as I tried a smaller WD drive and had no problem. Used the same power lead also.
This drive is configured as primary master and has the 32bit clip on. Not exactly sure if it's needed, but didn't make a difference with it on or off.