ive never seen a floppy with jumper wires .... but if your meaning the
ribbon cable that plugs into the back of the floppy drive then yes you can
get it wrong, but it should tell you at boot up that its not workin
correctly error code 40 or something like that, take out the plug and put it
in the other way and see what happens
shouldnt break anything ive done it a few times by mistake
Its possible that you have the ribbon cable plugged in to the drive
upside down. If you just installed the drive double check the cable
at both ends or just flip it over and see if the problem goes away.