PSU or other fault?

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dbr
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PSU or other fault?

Post by dbr » Tue Mar 31, 2009 7:31 am

When I got home yesterday, my computer would not start. It seems as if there is no power. I changed the cord, tried a different outlet, flicked the switch each way, but no use. Nothing. Dead. Not a flicker..

Is there anything else that would produce this result other than a broken PSU?

Is there a fuse or capicitor or something?

More importantly is there any liklihood that if I replace the PSU, it could not help??
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Dazzled
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Re: PSU or other fault?

Post by Dazzled » Tue Mar 31, 2009 8:08 am

Are any motherboard LEDs lit or are they all out? In either case, first find a fan connected directly to the power supply, not to the motherboard, and see if it spins up. If not, the PSU is your probable culprit. If it does, use a multi-meter to check each power connection in turn.

Which PSU component requires some testing if you can repair one. If it has a fuse, check that, otherwise it is easier to get a new one. If you ever scrap an old box with a good modern form factor PSU, keep it as a test and spare.

Oh.... first check that you actually have power at the outlet.
Last edited by Dazzled on Tue Mar 31, 2009 8:11 am, edited 1 time in total.

Munka
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Re: PSU or other fault?

Post by Munka » Tue Mar 31, 2009 8:11 am

There is a way to test your PSU, and rather than try to describe it here, I found this video that explains it well.
Just remember to unplug all the power leads inside the case, and also remember GREEN and BLACK, but have a look at the short video found here. http://www.metacafe.com/watch/729606/ho ... upply_psu/

Good luck
Munka

Dazzled
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Re: PSU or other fault?

Post by Dazzled » Tue Mar 31, 2009 8:20 am

Nice video Munka. The shorting at the plug takes care of switching via the motherboard when doing the fan test.

dbr
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Re: PSU or other fault?

Post by dbr » Tue Mar 31, 2009 8:24 am

Thanks. Will check it out this evening (can't stream at work).
Yes, the outlet is working - other devices on the power board are still up (and yes, unplugged it from the powerboard and went straight from the wall socket to rule that out as well)
No leds or other indications at all - as if it was unplugged.
No fans spin up. nadda, nix.
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Munka
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Re: PSU or other fault?

Post by Munka » Tue Mar 31, 2009 8:31 am

Yes following the video tutorial isolates the PSU as the culprit, better that it is the PSU than something on the M/board.
Replacing the PSU is a no drama event :D
Munka

dbr
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Re: PSU or other fault?

Post by dbr » Tue Mar 31, 2009 8:27 pm

She's dead, Fred.

Great video Munka.

Now to find a new one.

I s'pose http://whirlpool.net.au/wiki/?tag=PSU_Recommendations is a good place to start. Any suggestions for:

AMD 64 dual core
4 x SATA II
2 x DVD-+RW
4 x 1GB sticks DDR2
2 x 120mm case fans
USB powered devices
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Munka
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Re: PSU or other fault?

Post by Munka » Tue Mar 31, 2009 8:47 pm

dbr wrote:She's dead, Fred.

Great video Munka.

Now to find a new one.

I s'pose http://whirlpool.net.au/wiki/?tag=PSU_Recommendations is a good place to start. Any suggestions for:

AMD 64 dual core
4 x SATA II
2 x DVD-+RW
4 x 1GB sticks DDR2
2 x 120mm case fans
USB powered devices
Well it doesn't look like noise is a big issue with the case fans present :D
This one is the equivalent of what I am running, similar spec'd box though non AMD. You didn't a mention graphics card, but it is also PCIe ready. Not to mention a good price. http://staticice.com.au/cgi-bin/search. ... orsair+620
Munka

Dazzled
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Re: PSU or other fault?

Post by Dazzled » Tue Mar 31, 2009 8:48 pm

I've found this lot very reliable for high end and custom built machines. http://www.noobie.com.au/parts.list.php ... 20Hardware (It is the parts division of http://www.enspiredigital.com.au) I would try for about 400w-500w for that setup. I use the Coolermaster one in the link. They send them from Sydney, but I hear there is now a shop in Melbourne. In any case it gives you a price range to work with.

dbr
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Re: PSU or other fault?

Post by dbr » Tue Mar 31, 2009 9:34 pm

Yep PCIe Nvidia GeForce 7600GT 256 DDR3
MB = ASUS M2N-E

I don't notice the case fans - mainly 'cause the aircon vent in the study makes more white noise ;)

Forgot to mention (also) the PSU coming out is 450W Antec SP (came with the case). This was a budget build ~18 months ago. First time experiment. Run flawlessly since. Components from MSY. I did the noob overlook PSU thing (subsequent reading has shown I was lucky not to blow something important - phew!). By the way, this box survived a direct lightning strike on our chimney - only the router was a casualty.

Will follow up the links. Aiming closer to the 80-100 range. May need to up it a bit to make the Corsair. Coolmasters look to make it though.
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Dazzled
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Re: PSU or other fault?

Post by Dazzled » Tue Mar 31, 2009 9:45 pm

My everyday box pretty well matches yours internally (CPU/MB/Video etc). Mine has a Coolermaster case and PSU though, and there is a ducted CPU fan. The thing has never missed a beat, and it runs 18hrs/day, 7 days/wk.

dbr
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Re: PSU or other fault?

Post by dbr » Tue Mar 31, 2009 10:04 pm

Thanks Dazzled. Which model range Extreme, Extreme Power Plus, RealPower Pro?

http://www.msy.com.au/Parts/PARTS.pdf
http://www.pcdiy.com.au/
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Dazzled
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Re: PSU or other fault?

Post by Dazzled » Tue Mar 31, 2009 10:37 pm

If you're not thrashing the thing I'd get an Extreme 550 or Extreme Plus 550. The specs are on the Coolermaster site. They are newish standard duty models from a well-known maker, but why pay more for a medium performance computer?

My machine has done some serious mathematical 2 core work with large data set i/o for 30 hrs straight without complaining. The "Real Power" range is a step up, but you pay for it. I've another box with 64 bit Linux/2 core CPU on board and 3 hard drives for that sort of work, and the standard "Extreme" power supply has never troubled me.

Franpa
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Re: PSU or other fault?

Post by Franpa » Wed Apr 01, 2009 2:50 am

some PSU's require a connection on the Motherboard connector before they will power up.
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Dazzled
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Re: PSU or other fault?

Post by Dazzled » Wed Apr 01, 2009 7:31 am

That's why the paper clip was in the video.

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