Has my A1200 motherboard just died after 3.1 roms installation?

[Lurch]

Disconnect everything and just have the motherboard and PSU, turn it on and see what you get.

[Lurch]

I'm surprised the 3.1 roms has no insert disc screen like the 3.0 kickrom does, is that because the chip is a later one not made by Commodore after Amiga changed hands? It all works fine by loading discs etc and the hard drive works so I have no reason to think it's a problem with the chip as such.

The 3.1 does have an insert disk screen, it takes awhile for it to appear sometimes due to the looking for HDD delay.

Although you wont see this screen when you have a HDD installed.