If you only need a 5V feed, you can add it with a 5V AC-DC adaptor. Not pretty, but prettier than an ATX PS.
That is a bad idea for so many reasons, it shouldn't damage anything though, I think. My suggestion for this thread is to just skip the -5V line entirely. Ninety-five percent of all PC motherboard do not use the -5V line for anything. In fact, many newer ATX power supplies do not produce a -5V line. The only reason the -5V line is there in the first place is for ISA slots, which require a -5V line and since there are no ISA slots on any new motherboards, the lack of a -5V line should not be a problem.
The one noteable exception WRT motherboards is the MSI K8N Neo4/SLI (you weren't going to use a discontinued, Full ATX, first revision SLI motherboard in a G5 case in any case, were you?). :P The MSI K8N Neo4/SLI uses the -5V line for the onboard Soundblaster Audigy sound chip. Without the -5V line the audio does not work. Only MSI is dumb enough to make a motherboard with onboard Sounblaster hardware.
MSI makes some of the least stable AMD nForce4 boards anyway. Not that the nForce4 chipset is very stable in the first place. For that matter, the nForce4 chipset is looking pretty aged at this point anyways especially WRT onboard sound. The nForce4 onboard sound uses an AC97 codec as opposed to ATI chipsets and Intel chipsets which use the newer Azalia HD audio codecs, which are of better quality. However, MSI motherboards with other chipsets like the ATI Radeon Xpress 200 chipset boards work fine.
At any rate, now you have read my off-topic blather about the nForce4 chipset and I am sure you are better for it.:P
The board i am going to use is an Asus P5RD1-VM with the ATIXpress200 (X300) graphics onboard. The only reason why i wanted to convert the G5 supply is so that when anyone looks inside of the machine, it still had the clean look that it's supposed to have. No disregard to the Guys/gals that used a standard ATX power unit, but i like the cl3ean lines moreso. So if i can't use the G5 supply, i was told that 1U PS would work, and there are places out there that sell 600W 1U power supplies for a decent price. Then from there i need to mod the PS so it fits right and it looks like it was made for ATX boards in a G5 case.
Loc: Florida, USA
Rabbit is right about the -5v. You have to be careful for just not the sound but some motherboards use that -5v for the serial ports and the parallel port. Instead of modding that power supply for the PC motherboard you can just use a standard ATX powersupply. If you need longer cables then get extintions or if you want them shorter you can crack open the power supple and trim down the cables so when the caseing is back on it will look professtional.
Honestly, which one looks better? More apealling to the eye? ATX power supply or 1U power supply? *pictures are for reference only* I want clean lines and a boxy power supply will not do. The new 1U's have a -5v also and it will fit nicely underneath the power supply plate in the G5. I just need to mod the wires so they are not that long and that they plug in right.
I wouldn't recommend removing the power supply case permanently. It shields the rest of the computer from the relatively strong magnetic fields generated by the power supply. Removing this shielding could potentially wreak havoc when the machine is running.
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