Hmm, unfortunately I only have the two 16 MB modules that go in it so I can only try with the stock 8 MB or th full 40, which have both given identical results. Has anyone else here tried with something in between the two on an x100-series machine and got any further?

I did copy over the ModernOS Enabler, folder and .pef file as the readme file that came with the copy I have advised - they say only to replace the system file if you're running 7.5, not 7.1.2, so I didn't do that.