Dying A3000D?

[amigean]

I have only just been reading this (following a link to another user's signature):

http://amiga.erkan.se/index.php/my-broken-amiga-3000-is-fixed-and-fully-working/

could this be the cause of your trouble? It could be that changing the memory might have precipitated the problem elsewhere (just a thought!), or then again maybe not...