can you provide some pinout for powermac

Go here:
http://www.outofspec.com/frankenmac/wire.shtml

and here:
Accelerate Your Mac article 1

and here:
Accelerate Your Mac article 2

The subject has been discussed many times at Applefritter. You can find more links, and links to links, in my thread here:
http://www.applefritter.com/node/21069

and here:
http://www.applefritter.com/node/6699

and here:
http://www.applefritter.com/node/17936

and here:
http://www.applefritter.com/node/21844

(thought I'd throw together a list for my own records as well)

The real problem with using an ATX powersupply with a G4, besides the rewiring, is getting a power source for the 28v pin. If that pin does not receive enough voltage the computer will not turn on. Apple had the stroke of genius of running the power for the Apple display monitors through the video card. That created problems for not only trying to use ATX PSU's, but also with trying to use 8x AGP video cards in G4 towers. Of course, that's not Apple's concern.

I'm curious. What is your first language? Are you the person from Italy?

Hmm, I saw Powermac in the title, but didn't notice until now that this thread was put in the 68k forum, so maybe you should specify which Macs you are talking about. A 68k Mac is not a Powermac. Anything pre-G3 you'll have to get answers from someone else. The Beige G3 can use an ATX powersupply unmodified by changing a jumper in the top lefthand corner of the motherboard. The Powermacs are listed here:

http://www.lowendmac.com/ppc/index.shtml

Good luck.

Maybe the moderator should move this to the Powermac forum, and if you are talking about 68k Macs, you should start a new thread in the 68k forum without Powermac in the title.

You can also read my thread about successfully modding an ATX power supply[url] for a Powermac Digital Audio G4. It has useful links and tips.

http://68kmla.net/forums/viewtopic.php?p=12048#12048

The other best place to look is xlr8yourmac.com - search for ATX