I don't have the same setup but the 4000D that I modified probable draws more power. It's a 4000D with a Toaster/Flyer and all the flyer drives, plus 3 more ISA slot under the same 4000D case.(or a total of 4 harddrives, 3 flyer and 1 system)
I removed the 145 watt power supply and replaced it with a ATX 550 watt. The computer run fine with the ATX.
I could upload some pic. to Amiga.org if you want to see the modified 4000D.
Ron
