jpflemington
What threw me initially is that almost everything in the D530 can be removed/replaced without tools, including the motherboard. Even the lid has unusually readable diagrams showing how. I bought several of these a few years ago so I have "spare parts" :), and when it came time to replace the power supply, I figured, "Okay, so where's the cute little green release latch?... uhhh, hello little green release latch? Where the &#(!! are you?!?"
So google to point me to the rescue, to wit, this page :)
I really couldn't see how to get the darn PS out... and I got nearly fooled because when one removes the single screw holding the PS to the back panel, the PS will slide forward about 1/8", a damn teaser :) If HP had designed the securing slider holes in the base so that it slid forward to remove rather than backwards, it would make this a lot easier (no need to remove rear panel & motherboard).
To answer a couple of questions and observations in many of the comments:
1) yeah, you can probably get the power supply out without lifting the motherboard, but there is risk of damage to the motherboard because the clearance is *very* tight if not outright overlapping. The motherboard is very easy to disengage, I think one would have to be something of a twit to not lift it just for sake of the principle.
2) Any regular ATX power supply will work as long as it supplies the minimum current specifications for the various voltage rails (+/- 5, +/- 12, +3.3), you just won't be able to put it inside the SFF case. You will have a "bag on a box" which is fine if you don't mind function over form.
3) I wouldn't even try running window7 or above on this machine. Memory is limited to 4GB which is pretty much what I would consider minimum for running win7 for much more than email or light browsing. The processor is a single core 3GHz, and while it does provide for hyper-threading, this is really no substitute for a multi-core CPU which win7 is designed to take advantage of.
You know, in the bad old days, I used to be able to fix computers by reading books. Alas, in the last 20 years computers have evolved into so many different form factors that one simply can't keep up by just knowing theory and general experience. Nowadays I can't even imagine fixing some of the stuff I do without the benefit of Google and the internet. Getting into almost any laptop is usually a very specific sequence which must be done just right. Likewise with this silly PS for the D530.
As with anything else, it's quite simple and easy ONCE YOU KNOW HOW :) And have somebody who's been there before and is willing to share their experience with others.
Kudos to the author, a fine job, well done. Top drawer.
J