Comp. turns off after 2 sec!!

Ok, this is a fairly long and complicated problem. Please read through these. Thanks in advance!
Ok, well, i just got my K7ND Delta-L mobo today and after I put every thing into it, I turn on my pc. Well for about 1 second it looks like everything will be ok, but suddenly, it turns off. If I unplug the power suppy and plug it back in, I can try to turn it on again, but it does the same thing. Power light for a short while, then off. The power supply is 425 Watts. So I'm thinking maybe it's that power supply so I change it with a 300 Watt one that works flawlessly (as it was just in a comp i was using today) same thing happens. I've got everything pluged in (video card, power to mobo, power to cpu, cpu fan, ram, both ide drives, extra usb, and all the little led lights and switches). It looks like the power supply is working because the lan lights on the back are both lit up. So now I'm thinking that maybe the power supply isn't big enough. Is the power supply not big enough, do I get a new one or change the voltage on it from 115V to 230V?
My specs:
AMD Athlon XP 2700+
Crucial PC 3200 DDR Ram
Western Digital 80GB HDD
Polaroid BurnMax 40X CD-RW Drive
ATI All-in-Wonder 9600Pro
MSI K7N2 Delta-L nForce2 motherboard
Thanks in advance!
I have rephased the problem at the bottom of this thread.

i had some expirenced builders (3 of them) at my house and they failed to fix the problem.
Here is the problem rephrasd:
I have plugged everything into my motherboard (Asus A7N8X-E Deluxe) and
double checked the connections and the jumpers but when I press power
button, the pc starts for 2 seconds and shuts off. The processor is an AMD
2700+. I have taken it down to just the processor and ram but same thing
happens. I have tryed getting help on message boards (
http://bildeau.go-gaia.com/forum/viewtopic.php?t=672944&postdays=0&postorder=asc&start=0
and
http://cgi.techtv.com/messageboards?action=whole_thread_view&board_id=17&topic_id=73&thread_id=2557827&per_page=50
I have also tryed an MSI K7N2 Delta-L motherboard and switched out an
AMD 2800+ and new ram and have tryed a total of 3 power supplies (the
newest one is an Enermax EG465 that outputs 33A on the 12V Rail, and 35A on the 5V rail and 35 on the 3.3V rail) in both mother boards and tryed powering
up, but the same thing happens. Power goes on and the fans spin for maybe
1.5 seconds and then they stop spinning. No bios screen or anything
appears on the monitor, no beeps. Any help would be appreciated. Thanks.

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