IIGS FD EXTERNAL CARD?

[TRUC PHAN <TTPHAN@postoffice.worldnet.att.net>]

My Apple 2GS FD 3.5 doesn't work! I think the Controller (In the apple 2GS 
) bad. I check it by go to basic prompt [ and type PR#5+enter but it say 
"no device found" I buy another external 3.5 FD & plug in but it said the 
same; The system boot-up Ok on Hard-drive.
What sould I do? Buy another motherboard or looking for external 2GS 
Floppy controller? Do they make any of external FD controller for IIGS?
Thanks!