PC ATX Powersupply modifications

[JohnFante]

I have recently changed the PC ATX powersupply in my towerised Amiga 4000D. It uses a modifier like this to connect to the Amiga:

http://amigakit.leamancomputing.com/catalog/product_info.php?products_id=615

Unfortunately my motherboard died shortly after I replaced the powersupply. The original powersupply was a Enermax 300W and the new one a no name 500W. Apparently some resistors (and some more) on my motherboard was burnt and it could be caused by a dodgy powersupply. My old motherboard (I have bought a "new") was a bit dodgy so the error can be a combination of things.

However I am now looking for a high quality powersupply to use with the "new" mobo but I am a bit unsure what modifications I have to do. I could see that the original powersupply had one of the wires cut. See this photo:

https://dl.dropbox.com/u/139090/PowerSupply.JPG

I also did that with the new one. Is there any other modifications that I need to make? And are there any suggestions for top of the line powersupplys?

[JohnFante]

I use Antec TP-550 power supplies with digital recorders that are worth 5000$ each so you can go with this brand without worries.

And maybe this link will help getting some answers: http://www.ianstedman.co.uk/Amiga/amiga_hacks/Amiga_Power_supplies/amiga_power_supplies.html#Fitting_a_new_PSU_to_an_A4000

Thank you. I will look into the Antec powersuppy and the link.

At first I thought the converter was just more or less plug and play (with the addition of cutting a wire).

However after I burnt my old motherboard I got rather paranoid and I would like to be sure before I plug in the "new" mobo. One thing is 250 euro for a "new" motherboard but I would not like to thing of the possibility of frying my CSPPC ....

Anybody have any experience with this kind of converter?

[JohnFante]

I remember making the conversion from scratch on my 4000 long ago but it was an AT power supply, not ATX.  Never the less I used a voltmeter and checked every single wire BEFORE plugging anything.  

Make sure you get the correct voltage on each prior to connect, that's the best advice I can give.

I checket the current on my present powersupply.

It gives the following stable readings:

5V=5,17 volts
12V=12,21 volts
-12C=--11,45 volts

I am not sure if theese are "safe" numbers.  

Any comments?