A4000 help, Jim...I'm a doctor not a bricklayer

[Argus]

One of my A4000s ist kaputt.  Can't figure out exactly what happened but here's the symptoms.  Turn it on, get grey screen on monitor but no boot; hard drive spins up but no floppy click.  Keyboard can reset causing screen flash and one caps lock light flash an then same thing.  I've tried 'rounding up the usual suspects': i.e. cleaning it, changing simms, swapping roms, fast slot cleaning, w/ & w/o hd or floppy, power supply connector, etc.  There was some corrosion under on the upper left quadrant beneath Paula and the audio inputs apparently from leaking caps on the top side but I found no broken traces after cleaning thoroughly (maybe inside a via?).  The battery was removed long ago and there's no damage whatsoever in that area.  CIAs are cool to the touch though Paula is *slightly* warm (i.e. no more so that Lisa).

[Argus]

Okay, I checked the machine in a darkened room.  The power led comes on and maybe a fraction of a second later gets maybe twice as bright.  The harddrive light is on and I can hear the drive accessing like it's going to boot and then stops, leaving me facing a dark grey screen.  Suggestions?

I don't think it's the cpu card because it works with neither the a3640 nor with a known working Cyberstorm MkIII board.

And no, I can't access the boot menu at all.

[Argus]

@Thomas

Any ideas?  It seems to want to go but just won't.

[Argus]

Yes, I've had the m/b out of the case.  Still no luck.  The thing seems to be hanging where it should cycle to a light grey screen and complete the boot sequence.  The thing that is telling for me is no floppy is working on the external or internal ports (i.e. no 'click-click' during boot). Is this usually a CIA or Paula problem?

[Argus]

@Thomas, Patrik

Yes, after a while the HD light goes out.  I've left it running for up to ten minutes and no floppy activity.  Same thing w/ or w/o floppy, HD, etc.