IDE woes on 4000t

[X-ray]

Take the drive out of your dad's machine and test it with your machine. It is also a good idea to swap the IDE cables and test that too.

(By the way it is MUCH better to go with SCSI on the A4000T)

[X-ray]

@ Amesie

Yes, the SCSI on that CS MKIII is better than the SCSI onboard the A4000T. If I was in your position I would not investigate this IDE angle anymore and instead I would find an ultrawide SCSI hard disk for that Cyberstorm. You'll get way better performance.

As a matter of interest, did the IDE drives that didn't work on your Amiga, work on your dad's Amiga?
What happened when you put your dad's IDE drive on your Amiga: did you get the same black screen?

And which machine has the CSMKIII, yours or your dad's?
You should post both configs. I don't know if a CSMKIII has an early config menu like the PPC version, but if it has (try pressing esc on boot) perhaps you can tell us what settings you have in there.

[X-ray]

Okay I googled it and your CSMKIII can indeed disable onboard IDE. Check this thread:

http://eab.abime.net/showthread.php?p=211061

Thomas explains there how you can check if it is disabled or not.
Thanks Thomas!!

Edit: but that alone doesn't explain why you got a black screen.