I would try holding both mouse buttons down when you power up, just to see if you get the boot menu or not, If nothing comes up then I'd say the battary has done some damage to the tracks. But this doen't mean its just the video tracks, you could have a bad memory chip in the (Chip Ram array).
As far as replacing the battary, I used a standard two pin cmos battary clip from a old IBM computer, this way you can just pop the old one out and install a new one without soldering!
Your Opalvision video card is pretty good, but its not RTG and you will need a 23pin RGB monitor like the 1080, 1084, 1084s,etc.., The CV64,CV643D, and Picasso IV are your best bet! I have a CV643D in mine and it works great!
As for CPU upgrading, alot of the card don't work with out first making and small mod called INT2, This has to do with cards that have SCSI controllers on them, they wont allow the internal scsi to start up, or something, I have a A3640 installed in my machine, Its a 68040@25MHZ and makes a big differance over the internal 68030/68882! A 68060 card would be much nicer still but the A3000D drive plate doesn't allow you to use many of the boards, even with my A3640 I couldn't install a good fan/heatsink combo, I finally used a heatpipe with fan off an old IBM thinkpad notbook! This works very well as the fan blows the hot air straight to the PSU fan and out the back, as a bonus it cools my Zip Ram aswell!
I have another A3640(no heatsink) rev. 3.1 that is in Like New condition for $85 bucks, that is if you can get the machine up and running..Hope this helps and good luck!
Email:zxoney@charter.net
