A4000T appears to be dead

[Argus]

Did you happen to not properly plug in the floppy drive?  I did this once with my A4000 and it gave me a sound like something was shorting a/k/a static.  Check all of the drive cables and power leads to make sure a pin hasn't been missed.

[Argus]

@X-ray

I'd still check all of the connections to make sure you don't have something not plugged in right or not all the way.  Maybe the ROM ICs or one of the daughter cards have wiggled loose?  It's worth a shot.  Black screens may mean there is a short somewhere, or perhaps the PPC and SCSI drives are drawing too much power for the p/s to handle.