do what redrum said....
the 3640 in a A3k was a tricky one for me. I had a 3k 030/16mhz...my 3640 rev was 3.1 (3.0 will not work).... there are a few jumpers around where the 3640 plugs that needed to be fiddled with just to get it to boot..
http://www.amigau.com/natamiga/t-a3640.shtmlJust start with 1 thing..plug in the 3.1 roms, no HD, nothing..turn it on..see if it comes to insert floppy screen..then plug the 3640, fiddle w/the jumpers per the webpage..turn it on..etc.
