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New build..not powering up...

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9 replies

by yashy99

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Hi everyone

I've put together a new build and after trying to troubleshoot it for the last week, I have no hair left:(. If anybody could shed some light, I'd be very grateful.

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 shitty PSU I bought or could it be motherboard shorting?

Thanks again
Yashy

9 replies

by cmiller5400

Then something fried. Sorry. I'd look for burnt spots on the MB. Pull the CPU and see what it looks like. Try testing the MB with another PSU. My bet is the PSU fried the MB. Check to make sure that you didn't accidentally short the MB to the case as well.

by brian

i have seen this before with power supply's (antec psu's). the power supply would read good voltages and also would power up if attached to a power supply tester, but when plugged to the board, it wouldn't power up. turned out that the components were drawing too much power for the psu and it was shorting out. i would still check your board and processor for burns/scortch marks, but i would almost put my $ on the power supply.

by snuffy09

you blew the PSU.

the only thing i have ever smelt burining in a computer came from the PSU.

And yes, fans can spin and lights can come on even if you have a failing Power supply.

was it a stock psu that came with the case? they are trash most of the time so i wouldnt be surprised if it blew. If you purchased it get a RMA from company.

by mjd420nova

Try sniffing around the power supply, if it has that burned smell, then it's the power supply that's at fault. If it doesn't smell, then it is most likely the motherboard. I have seen a bunch of the ASUS motherboards that had bad capacitors. Check out the board for any leaking or bulged capacitors that could be shorting the power supply. They should be located arouund the power connector.

by cmiller5400

I had a ton of those on the Acer boards a few years back.

by butkus

I would bet the PS. The jumper trick is a quick test but there are testers that have resisters built in. Many time a PS will show power, but no amps behind it. Hence you don't get anything to work. Try another PS above 300W just to see if it boots. Only use 1 stick memory (correct slot) and no video card. Strip it of everything just to boot. The light on the MB means it's getting some power.
And of course... static electricity frying the cpu. They make testers for this, plug them into the MB slot and they show the BIOS commands and where it stops.
Can the BIOS handle the CPU? Way many CPUs out before the BIOS understands the new commands.

by yashy99

Guys,

All of your responses have been helpful. I'm going to bury my nose into the MB tonight and have a look, including taking a look at the CPU. Definitely will be on the case with the PSU manufacturer. I actually bought all of the components separately (from a component part vendor) to build a PC...but I'm praying it's not the CPU.

I'll keep you all posted...

Yash

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