How can I get my A: drive working?

I am having a problem with my a: drive (actually several) every time I put in a disk it says the disk is not formatted, even manufactures software disks, I have tried 3 different floppy drives and get the same problem, I cant install the software for my digital camera or back up any of my files, please hep me with this problem. I have checked the ribbons and the ribbon slots no pins are bent or missing there are no apparent breaks in the ribbon, the drive acts fine and lights turn on when they are supposed to, have checked the disks in other computer and they work fine.This is driving me nuts.I have tried 3 different models of floppy drives, tried reinstalling (updating) drivers but computer say's no drivers are needed.