Amiga 2500 question

[orb85750]

I have an Amiga 2500 with OS 1.3 that will boot only if the A2630 card is in the machine.  I thought that a 2500 was simply a 2000 with the addition of an A2630 (or A2620).  The 68000 chip is firmly in place on the motherboard, so I have no idea what is going on here.  Could the 68000 or something else on the motherboard be damaged?

[orb85750]

Gray screen.  The battery is gone. The motherboard is showing some blue residue from the old battery.  It's not out as far as the CPU, but I suppose it could be damaged anyway? Can chipset and motherboard revision really make a difference here? REV 6 and OCS. I'm not the original owner.

[orb85750]

Leaving that blue goo on the board is just as bad as if the battery was still installed. Cleaning that up should be your first priority.

OK, thanks for the advice (that makes good sense).  If I can get it to work properly, I'll certainly spend the the time to clean up the motherboard.  But I'm afraid that either the damage is already done, or perhaps there is something weird going on that I don't understand.
(It certainly wouldn't be the first time for either case.)

[orb85750]

Not quite,

rev 6.3 = ECS, Kickstart 2.0

but

rev 6.2 = OCS, Kickstart 1.3

Correct, and this one is 6.2.

Thanks everyone, for your suggestions.  (Yes, the 68000 chip is installed and secure.)  So if I find a problem with a trace, do I just try to solder on thin wires to the motherboard?