New build powering problem

April 21, 2009 at 01:54:28
Specs: Windows XP, Core 2 duo/2GB ram

I've put together a new build and have been troubleshooting this problem for the past week. I'd be grateful for your comments as I'm losing the plot here:)

These are main components:

Asus P5KPL/1600 S775 G31 ATX
Intel Core 2 Duo (E7400) 2.8GHz
Trust PW-5250 420W Low Noise Big Fan
Kingston 1GB HyperX DDR2-800 x 2

After putting it all together, I hit the power button and it kept on beeping. All of the fans were turning. So I turned it off. Then there was a slight burning smell. Next time I tried, nothing would turn on.

Now, only the motherboard light remains on. When I hit the power switch, the chassis fan spins for literally 1 second and then turns off. Nothing else comes on or turns.

I troubleshooted using Multimeter:

Took the PSU unit out. I put a paper clip between the green wire on the ATX and the black wire. Powered it up and the fan was spinning.

Connected it back up to the board. Used the multimeter to measure the red, yellow and orange wire readings whilst I pressed the power button and the voltage readings go up to their expected numbers and then go right back down to zero (they would because the PSU doesn't stay on I guess).

Could this be the s---ty PSU I bought or could it be motherboard shorting?

Thanks people

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April 21, 2009 at 04:57:13
You should always benchtest your hardware before installing it in a case. That being said, the beep code is an indication of what the problem is.

I have no idea about the quality of the power supply but I know I wouldn't buy a unit from a manufacturer that doesn't the specs:

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April 21, 2009 at 05:36:56
I agree with jam about the PSU. Additionally, the PSU has windings that can produce an odor is overheated or if poorly made.

If you are located in an area that requires 230VAC and you set the voltage selector for 115VAC you can immediately toast all the hardware because you would be sending twice the required voltage to the hardware. If that happened then everything might be ruined.

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April 21, 2009 at 08:05:37
Thanks for the responses guys.

I know, I should have benchtested the thing.

I'm pretty sure that it was set to 230. Are there any other diagnostics that I can try to see whether anything has 'died'?

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