Er, does "correctable frying" of Apple IIs exist?

["Neil Thayer" <sark314@hotmail.com>]

Perhaps eight years ago, at what will show itself to be the dumbstoopid age
of 11, I had my dad obtain (for free!) a mint condition '78 Apple II from a
friend of his.  At the time, I had only a hazy idea of its historical
significance and collector's value.  I asked him to get it mainly so I
could play some really old Apple versions of Atari games (Burger Time,
Centipede, etc.).  So one day I'm fooling around with the hardware inside,
right, and I remove and reinsert the disk controller card while the unit's
on.  (Yes, I know, the most idiotic thing possible, but I was 11.)  The
unit hasn't worked correctly since.  Sometimes when it boots up it won't
automatically access the floppy drive (and yes, it did before, I had the
ROM upgrade); sometimes the keyboard characters don't correspond to the
keys.  Is there anything obvious that might have been fried and could be
corrected?  Not a day goes by that I don't curse myself for ruining an
absolutely mint original Apple II (and a FREE one at that!) all those years
ago, and I figure I owe it to myself to at least try and fix the thing. 
Any ideas?  Any?  :-(

Neil