It's dead Jim (4000D)

[Argus]

Could be a lot of things.  I always suspect the floppy drive cable first 'cause it's real easy to not plug it in right or accidentally partially unplug it and it won't boot.  I had a hell of a time getting a cdrom installed recently given the tight spaces in the 4000D.  It's real easy to unplug something accidentally or switch the cable around the wrong way.  I suspect this is probably your problem.  Try different combinations of the power connectors, maybe there's a break in one of the old wires. Also, make sure the power supply m/b connector is not grounding to the case beneath (leads are long and can penetrate the thin plastic beneath.  There could also be corrosion somewhere (e.g. my buster socket was crappy and caused either no booting or dead Zorro slots).  When you power it on, if you get a faint grey screen that's a good sign that she's not dead.  Think like Mr. Spock and you should be okay, don't panic.

[Argus]

Ronmor wrote:
Now the motherboard is out of the case and setting on my work bench with no cables or daughter board, still no go.

Try bench testing with the daughterboard installed.  I'm pretty sure it will not boot w/o the daughterboard in.

Regarding the rom sockets, try cleaning them with contact cleaner.  Mine were dirty before and caused intermittent booting.

[Argus]

@doctorq

Yes, I remember bench testing an old a4000 motherboard just on some antistatic plastic, it did boot fine.  Guess that means I'm not one of the old wives.

@Plaz

In the true Amiga spirit, maybe we should start a petition to bring back Red.  If enough people signed on, maybe he'd drop his C=128 long enough to post here.

[Argus]

no, the cia chips in the 4000 are small square plcc type chips, different from the larger dip style in the 500, 2000, 3000, etc.  I think they're the same as the ones in the a600 and a1200.