Odd Power Supply Problem`

I was starting up a pc running xp. during the booting process, everything went dead and would not start back. I concluded it was the power supply. I happened to have another 300w supply on hand. I hooked it up and started it. The computer began to boot up and in the middle of doing so it died again. Now it wont start with either supply. What can cause this? The fuses on the supply is in tact. It shuts down "completely" , just before windows appears.

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Circuit68Asked:
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MoondancerConnect With a Mentor Commented:
Thanks for your help, Eric.

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sorgieCommented:
check all the simple things first.
check every connection and reset your processor and memory.
Did it go through the mem check the first time.
If you have muliple memory sticks try one at a time.
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Gareth GudgerCommented:
You might want to check the actual power cord. I had a short in the actual power cord that ran from the outlet in the wall to the back of the computer.

If not, does it completely power off when it dies? At what point did it die? Did you see Windows splash screens or what?
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kiranghagCommented:
just start the smps only wihtout any load
the fan should run
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FlamingSwordCommented:
Check your fan.
How many blades left.
How stable is it?
Sounds like you need another one.
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Death-SpeakCommented:
How much do you have packed into your system? If you have multiple CD drives and multiple HDDs, along with an Athlon system, 300w may not cut it.
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EricWestboCommented:
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