New socket 775 mobo, ddr2, and 160 GB will not load XP OS

My Dual PSU rig, using 1 Power on

Setting up your system to run dual (Master/Slave) psu's is very simple.
What you need:
2 atx psu's (example: Matched 300w), electrical tape,
2 wire connectors and space in your case.

I chose to mount the slave PSU inside of case running
Link wire 14(green) & 15(black) inside to pair up with internal PSU 20 pin.

1. First thing to do is make sure that both psu's work.

2. Now locate the plugs that hook up to the motherboard on both psu's. (20 pin)


3. Identify Link wire 14(green) & 15(black) on both PSU's.
Cut the 20 pin plug off the slave psu. Now cut and cap (elec. tape)
remaining 20 pin wires (not the molex wires) all the way back to the slave PSU.

4.Then splicing wire 14(green) & 15(black)
to the master PSU wire 14(green) & 15(black).
note: Do Not cut plug off the master PSU

5. I cut only wire 14 & 15 on the master PSU about 1 1/2" from plug
and used wire connectors to make the following connections.

6. Link wire 15 (black) on both psu's together, line 15 is ground and to run
dual psu's you need a common ground.


7.Link wire 14 (green) on both psu's together, line 14 is the "ps-on" line
which turns the psu's on using just the Power on button of front of case.
Now your done with the master psu, the master psu is the supply that
mounts in your standard PSU spot and plugs into the motherboard.

I have used dedicated molex's from the master PSU to run my 6800 gt
and motherboard (20pin & 4pin Pentium) & HDD'S/ the slave PSU for
cdrw & dvdrw, internal fans & external radiator 120mm fan & cooling pump.

Note: this method only allows you to run two psu's in one case as separate
units, master/slave. The master PSU will supply the 4 pin plug to the
motherboard. I have since cut all un-used cables from the slave PSU ie;
20 pin & 4pin, mine had a weird 5 pin too.

Nice post SOcRatEs, very well laid out and informative. May I just make 1 small comment. Running the fans and the HDD/DVD/CD etc off the slave seems perfectly fine/super to me. But I'm a little nervous of running a video card off the slave. My concern is the 2 supplies are still actually independent, thus their actual voltages (outputs) will be slightly different (intrinsically) and under different loads. The video card does get some power from the mobo (master PSU), so I would think there's a slight voltage difference at certain points in the card.

I guess what I'm trying to say is parallel PS's work in a funny way. If PS1 is slightly higher in voltage then PS2, then PS1 actually carries the whole current load until it's overloaded. Then it's voltage drops below PS2 just a little and PS2 kicks a little current, just enough so PS1 is no longer "overloaded" and it's violtage comes back up. All this results in PS1 giving 99% of the current, 99% of the time.

At this point I have to admit I'm not sure what happens when the video card gets some of it's current from the mobo supply off PS1 and some of it's current from the molex off PS2.

How long have you had this set-up running? I suppose if the above known effect was acutally taking place w.r.t the video card you would have noticed a problem long ago.

Cheers.

Thank you.......
I have modified above. I've run this way for at least 4 months now.
I have tried several configurations and settled on the above edit.
I never saw any differences in any of the configurations.
I just felt for same reason you mention, that this config does make more
sense. I've also opted for matching psu's as well.
It isn't so much the output being different between the psu's,
as the draws are more balanced.
Without question, I draw less from each PSU than I did from 1 500w,
Recitfying less current and creating less heat. Less draw also means
lower amps required from each 12v rail.
This config also protects me should the slave fail, I'll get alarms from fan
failures.

Yes definately a very good idea and nicely put together I must say.
Cheers mate.