This is why you should get the same type of RAM or similar. Never mix values or different zip ram types.
Make sure that zip are in their proper banks (its obvious but some people don't understand this still 19 years later).
http://www.amiga.org/forums/showthread.php?t=40992Did you check for that before installing them? What do your ZIP rams say on them as far as "labels"? Not all ZIP Rams are compatible with A3000.
Bad or damaged zip rams may cause no boot on A3000. And green color is it. I'd try removing all (or one bank at a time) zips and booting off the internal cpu (68030). Actually, i'd first try disconnecting the powersupply and connecting it back in. Your A3000 can still boot with 0 memory. Press down all chips. Check crystal clock is ok. Cleaning daughterboard slot perhaps for your 040 cpu? If this won't work then... Sigh, now only a qualified tech person might fix your A3000. Still, it's kind of hard to kill any amiga.
