Amiga 4000 WOES...

[MaDDuck]

This post will sound simelar to, " A4000 - help greatly appreciated" But I assure you that it is unique!!
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This is an Amiga 4000(d) with 16 MB of RAM on the MLB
 Standard 3040 68040 stock CPU
 Standard 1.76MB HD floppy drive
 Standard KS & WB 3.0
 EMPLANT board (with working SW!!)
 A *REV B* MLB (the one with 5 SIMM sockets on it!)
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 

 Now..................
 I just inherated an Amiga 4000 from a friend who lightly used it (wrote a textbook and song lyrics, etc.)since new in fact I helped her pick it out, set it up and upgrade it a few times over the years!  

It gives an error upon bootup saying there is no FAST RAM. Knowing better (I had installed 16MB in there several years prior) I disconnected all cords and opened 'er up.

 What I saw was exactly what I was NOT hoping for. The battery had leaked and gotten [goo] on the lower SIMM socked and judging by the looks of the SIMM itself, had shorted it out.

 I then cut the battery off (very carfully!) and using some baking soda and cotten swabs cleaned the aera around the battery as best I could.

 The board looks great, but there was some (blue!?) crap on the socket itself, most of which I was able to clean off.
 
 I then replaced the 4MB SIMM and fired it up. It booted correctly and seemed to work. Even the EMPLANT ran correctly. It the most memory intensive SW that I have installed on here.
 
 But after a reboot- nothing.  
 
 I rotated *SEVERAL* known working 4MB SIMMS around various sockets, confirmed that the jumpers were set correctly (THX big book of Amiga hardware!).
 Still nothing.
 
 I then disconnected (one at a time)
 The EMPLANT board
 The HDD
 The FDD
 The RAM in 1 & 2 slot tries.
 
 And I even pushed down on the only socketed chip on that side of the board (SUPER BUSTER 11) and to no avail!
 
  I've been an Amiga owner/user since 1991 and have averted many problems over the years, but I must admit that I am truly baffled!!

 Any sugggestions?
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 ALSO:
 Would installing 8 or 16 MB SIMMS hurt the Amiga? I know the MLB would not see the full ammount- but will it cause any damage?
 
 During the troubleshooting that I have outlined above- I left the SIMM in the CHIP RAM SIMM slot the entire time
 
 The corrosion only seems to of gotten to the lower SIMM socket, all others seem clean.
 
 
 THANKS!!!
___________________________
Come the millennium, month 12,  
 In the home of greatest power,  
 The village idiot will come forth  
 To be acclaimed the leader.  
 -Nostradamus 1555 :-D

[MaDDuck]

good guess!!!
the CHIP socket is at the top, closest to the riser.
and on further examination, I've noticed a couple of things.

1. the floppy drives do NOT click so it seems to have its problem while still doing the power on (pre-boot) stuff

2. there was only VERY minor corrosion under the battery so I doubt that caused any problems afterall.

3. the SIMM socket with the burned out SIMM may be the culperat. It is burned out aprx. 3/4 of an inch in from the side, not on the edge closest to the battery.

4. the 68040 card is a model A3640 not an A3040 as I stated above. Musta been punch drunk from thinking 'bout this all bleeding day!

Thanks bunches!
Keep 'em coming!!!

___________________________
Come the millennium, month 12,  
 In the home of greatest power,  
 The village idiot will come forth  
 To be acclaimed the leader.  
 -Nostradamus 1555