Amiga kickstart ROM 3.1 vs A600

[Lurch]

Trying to get an A600 to use a 3.1 ROM, works great on the A500 but in the A600 I just get a black screen and the A600 just sits there.

Original 2.XX ROM works fine, and so does a 1.3 ROM I have.

The version of the ROM is 40.63 so should work from what I've read, at a loss :-/

[Lurch]

Thinking it's the IDE Time out issue, as the 3.1 ROM works fine once transferred back to the A500. Will give that a try thanks guys.