Reviving an A4000 - problems!

[McVenco]

I bought a nearly complete A4000/030 a while ago, and I'm trying to get it to work while taking some parts from my other A4000s.

When I bought it, it lacked a Buster chip, a floppy drive and a CPU card. I ripped those from one of my other machines and installed them, but the only thing I get thusfar is a blinking powerlight, and a grey screen (there seems no difference in shades of grey when I reset the machine).

What can be the problem? I already tried 2 different CPU cards, a different Chip RAM SIMM, and I pushed down all socketed chips.

Any idea?

[McVenco]

Yesp, I tried every possible way. Even swapped some parts from my other A4000s (daughterboard, simms, PSU, CPU card, ROMs), but nothing. So I have no clue what it could be...

Jumper settings are the same as my other, working A4000s, and the battery area is clean (battery removed)