Hi there! I guess you installed the FastATA drivers so the FastATA can work properly?
http://www.elbox.com/downloads_fastata.htmlAnd then, why dont you try backwards, first connect only floppy drive, if it works, then floppy + seagate, if it works, etc etc. That way, you can "see" or have an idea where to start to fix things.
Try this. Im sure many others will help you deeply than me. Its been too long since last time i used a config just like yours, and i had many problems, but at the end, everything was cool, thanks to the folks here, who gave me lot of info and help
Sebastian
PD: im not sure but...i think, not 100% sure that FastAta and Mediator dont like each other...why dont you try also taking Mediator apart, and test the FastAT part first? then you can move on.