I just sent you an offer you can't refuse for some Bootstrap ROMS's, but wait... I didn't know about the extra RAM. Two came with your machine? You're talking outside of the 256kb front panel, right? So you have a DKB Insider *and* an external RAM box that hangs off the right hand side expansion port? After everything you tried, have you tried to boot the Amiga plain vanilla like? By that I mean yanking out any internal RAM that fits in the 68000 CPU socket, the 256kb front panel RAM and anything hanging off the expansion bus...
Red screen *is* supposed to be the ROMS, but just trying to help rule out anything else.
You should post a pic of the inside of your machine so we can see just what's all in there. Might be you have a DKB Kwikstart board with a Kickstart in ROM and an Insider?
Edited by save2600, Thu Dec 8, 2011 3:48 PM.