Von I really hate to say it, but such is strong evidence that: (1) You have a bad IIsi ROM, and (2) the EBAY seller who sold it possibly misled you. Did the listing say it was tested? Was there a non-DOA guarantee? Did you question the seller extensively prior to purchase? I'm not saying you did anything wrong at all Von. I am suggesting though that you were sold a bad ROM. And since it shipped in an anti-static bag and since you seem to know your way around the internals of old Macs enough to not zap circuitry to death, my guess is that it was bad before it shipped to you.
Now, to those of you who think the IIsi or IIfx ROMs are only about "32-bit clean" and running System "7.6," you are wrong. For one thing, the IIsi operates the same as the IIfx ROM except for the fact that there are no horizontal lines at startup with the IIsi ROM. That is "difference enough" for some IIfx ROM owners to seek out a IIsi ROM to try. That was my reasoning, which is why I now own both ROMs. In addition, with either ROM, you can run OS 8.1 which won't work on the stock SE/30 ROM. What's so special about that, you ask? Because the networking files that come with 8.1 allow your SE/30 to network with even the newest OS X Macs. And by borrowing some of those networking files from OS 8.1, you can then get 7.6.1 and 7.5.5 to network with your OS X Mac too.
Anyway, I'm sorry about this situation, Von. What a let-down that must have been to get something you'd long been waiting for only to discover it was a bad Apple! >
