Hi i have a dream a nice,silent,fast,expandable and cheap morphos box :D.
So i decided to build my own.
I bought a Powermac G4 Digital Audio motherboard including a 466 cpu and heatsink total cost 15 usd + shipping.
Then i got a big case 80 usd not cheap at all including a 500 watts psu.
I already got a sonnet 1.4 ghz accelerator board.
Then i modified a molex 24 to 20 atx adapter to the powermac psu the connector is the same but some wires carry diferent voltages/signals the modification is very simple.
The wiring diagram is here.
http://www.entremaqueros.com/bitacoras/roshardware/archives/g4-digital-audio-atx-adaptar-la-fuente-atx/
http://atxg4.com/gige-da.html
http://www.mactech.com/category/type-article/macmod-web-site/powermac?page=1
http://www.smps.us/power-connectors.html
The only deference i found is that the most easy way is connect the mac sense +28v line to the purple +5v ATX wire the firewire port will not work this way also adc monitors cannot be use but who cares. I connected the reset and power buttons to the case buttons and left the power led and hard disc led disconnected.
The ATX case need extra holes to acommodate the MAC motherboard the screws don't fit ATX standar case.
Also flashed and cuted the traces from a ATI Radeon 9200 256 PC edition, works great on 2D but i get some graphic glitches on 3D i will post extra deatails on this later when i get home maybe someone can give me a hand.
The only issue i got is that i got the chord chimes every time the computer start. But the onboard sounds works randomly if i reboot 5 time 1 of the five times i got sound working maybe someone have an idea of this issue.
Posting pics leather when i got home of the build process and results :D.

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nice, I always wanted to do something like this to loose that Apple on the outside ...

Neat PSU-mod, you've made a great MorphOS machine from a humble G4 powermac. I love the Cooler master case too, great choice!

Well did pretty much the same with a QS and a C= gaming case last year, worked for a while until something fried both the PSU and QS-mobo.

Replaced the mobo and just bolted the orginal PSU into the case (after installing a regulated fan&temp sensor).

The best is very low on noise much better than the original G4 case, and runs much much cooler.

Fantastic! :)

I got a new powermac motherboard for this another digital audio board and fixed the random glich on audio but after comparing the 2 digital audio motherboards side to side i can see some differences.
On one off the digital audio boards theres another unused 4 pin power connector and theres traces on the motherbord to solder another 2 usb ports but they are not present maybe apple planed some extra fatures and never added them.

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