I think you figured out 1 of the problems. Security chip. I have 3 sets of chips. The guy before me had 2 sets, originals & set(w/HD) from the net somewhere. Problem is I don't know which are which. All say v2.7 and the one had a leg broken off . Smitdogg fixed that one the best he could and made a set of back-ups for me. Anyway, changed to the other original chip and that seems to have gotten rid of the FIFO and other boot problems except for the rom checksum & low CMOS battery.
Still no stick input though and nothing on P4 at all. Also, can't boot into NFL even with the dips, just goes to NBA. I've got the other HD here so I guess I'll take it with me Monday & swap em. See if this drive can do it. It says V3 on it, the other is not labeled.
Guess I'll see what happens tomorrow...
Pessimist: Oh, this can't get any worse!
Optimist: Yes, it can!