Guru 80000004

[orange]

sorry to dig this one up, I have a similar problem but with 060 card in A4000. also sometimes there's a flash of blue screen (custom chips bad). usually it gives guru 80000004. I've tried reseating cpu card and it sometime seems to make a difference. also, i used a lot of contact cleaner spray on power connector, hope that didn't break something.
 what could it be?

are 040 libs and patches absolutely neccessary? because, sometime it booted OK without them.

[orange]

define 'necessary'.. will it guru and burn in flames without extra libs?

what is the most reliable and simplest way of telling if its hardware of software fault?

how to test CPU and custom chips?

[orange]

its a complete disaster; several capacitors have leaked 'burning' surrounding traces and components.
also when I replaced batt many years ago, I probably used soda and some white fluffy stuff has now 'grown' around where batt used to be.

it sat in closet for many years, I should have checked caps. d-oh

[orange]

here are some photos of the damage:
http://www.fileden.com/files/2006/9/12/214909/Amiga/photo/pa250005.jpg
http://www.fileden.com/files/2006/9/12/214909/Amiga/photo/pa250011.jpg
http://www.fileden.com/files/2006/9/12/214909/Amiga/photo/pa250019.jpg
http://www.fileden.com/files/2006/9/12/214909/Amiga/photo/pa250020.jpg

(about 5Mb each)

[orange]

@tone

yes, I had the same idea, its CS MK I card. IIRC, it should have rainbow effect on boot. but I tried it with CRT monitor too, and there is just a flash of blue screen. another thing is that not every boot (cold or warm) is the same. various commands from startup sequence fail. sometimes it seems to work just fine. but if i try setpach command it almost always crashes or monitor goes out of sync. capacitors definitely need replacing as well as some tracks and maybe ICs too. its gonna be tedious, sigh..