A4000T PSU - should I replace it?

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Given how cheap a replacement AT PSU is, or an ATX with an ATX to AT converter, I would say it is well worth changing that PSU. Look in the gallery under X to see my pics, you will see how I did it to mine.

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The position of the PSU in the A4000T is not really clever at all. It is mounted so that you lose a good amount of space above it. That and the difficulty accessing the innards makes the A4000T case not such a great design functionally. I don't think that installing a smaller PSU will help.

AT PSU: I got mine from a local computer fair a while back, for £6. That vendor isn't there anymore, so online will have to be the next step. But....I would go the ATX route instead. Get rid of the AT, and then open up your options considerably.

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Yes, when I did it there was no need to mod the case.

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Mine was a generic one for a few £ from the computer fair. This is what it looks like in place:

http://www.amiga.org/gallery/index.php?n=2737

If you can, try to get one with a long switch cable. The one I got was a bit short and it has to go through a drive bay to gvet to the front bezel.

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Click

Have a look, scroll down.

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Your current AT PSU has a switch from the PSU to the front bezel of the Tower.
You'll need a converter that retains that switch or at least has the leads that you can connect to your existing switch. I replaced the whole lot (a bit more work because the switch panel on the bezel must come off).

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Here is one where they don't sell the switch:

http://www.power-on.com/images/product/accessories/atxtoat2.jpg

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You won't have to cut: the cable ends clip on to the switch tabs. There is no cutting or modding at all, the only thing you have to be sure of is securing the cables properly.

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I'll have a look at mine and see what gives.

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OK see here:

http://www.amiga.org/gallery/index.php?n=2737&page=1#comment14648

No problem, all 4 screws aligned.
By the way, ignore the little bracket inside the Amiga case which rests on the upper surface of the PSU.

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Oops it is upside down, yes.

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"....What would be the advantage of using an ATX PSU over an AT one in the 4000T..."
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For me it is about sticking with newer technology. Might get better cable management, a quieter PSU, that sort of thing.