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psu issue/psu size

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Last response: in Components
February 21, 2010 11:13:23 PM

I've got a problem with my psu I believe. I was playing some game, relatively intense gpu/cpu wise, and my computer blipped and shut down. It has not powered up since. Attempting to turn it on just starts all the fans pulsing at ten second or so intervals. I've checked the outlet, etc... I haven't made any changes, moved any cords, etc... so I am fairly certain the psu is just dead. it's a little over a year old, and I ran it fairly non stop, with a few breaks here and there. It was a 650 watt Antec.

My system is:

Asus p5k pro
older core 2 duo (don't know exactly which, somewhere around ~2ghz)
500gb sata 3.0 hdd
evga geforce 8800 gt 512
2gb (2x 1gb) pc2 8500
antec neopower 650
sata dvd-rw drive

I play some stressful/modern games, and I would like to add another 2gb of ram and a 250gb (at least) drive, so I am wondering what size psu I need, assuming mine really is dead. Thanks all.

Edit: err, I meant psu, not cpu in the title...

More about : psu issue psu size

a c 246 ) Power supply
February 22, 2010 12:19:18 AM

Major bummer! :( 

Any chance you have a spare psu or one you can borrow to find out if anything else fried?

The general rule of thumb is a high quality 500 to 550 watt power supply with sufficient current (amps) on the +12 volt rail(s) can easily power a system with any single video card made. A high quality 700 to 750 watt power supply with sufficient current (amps) on the +12 volt rail(s) can power a system with two video cards operating in dual mode. There are a few exceptions like the new ATI Radeon HD 5XXX series cards which use less power due to their energy efficiency.

A high quality 500 to 550 watt psu will have a +12 volt rail rated at 40 amps. A high quality 700 to 750 watt psu will have a +12 volt rail rated at 60 amps.

In addition the power supply should be at least 80+ Bronze certified for energy efficiency. There are some models available which have achieved 80+ Silver and 80+ Gold Certifications.

Before purchasing a new psu you will need to decide whether you will eventually have a pc with one or two video cards.

Corsair and Seasonic are two of the brands that have a reputation for high quality power supplies that consistently earn high marks in technical reviews. They are reliable, stable, and come with a 5 year warranty. Some of the newer models come with a 7 year warranty. Lately we've been seeing a few other brands offering some high quality units.
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February 22, 2010 12:24:54 AM

Thank you Johnny. I can't really borrow a psu, otherwise I would have by now, but I do realize that would definitely simplify troubleshooting. I have no intention of running sli/crossfire, and if I ever do, it will be with a new system, not this one. So 500+ will be solid. Thank you again. Your advice is much appreciated. As for warranties, I should have held on to my info, I am fairly certain my antec had a three year warranty had I kept any receipts/packaging.
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February 22, 2010 12:25:12 AM

What do you mean pulsating? Are the fans spinning? Try reseting the CMOS and remove and resit your memory sticks.
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a c 255 ) Power supply
February 22, 2010 12:37:10 AM

Tried the paperclip trick ?

Disconnect all power cords from the PSU to "stuff", leave a fan or two plugged into molex connectors then jump pins 15 and 16 on the 24 pin power connector and see if the fans spin

http://pinouts.ru/Power/atx_v2_pinout.shtml

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February 22, 2010 12:39:36 AM

@darkguset: I mean the system powers for an instant, all the fans whirr up, and then the power shuts off and they slow down, then it repeats every ten seconds or so. A light blinks on the dvd drive, etc... The power is only on for a fraction of a second though, I can't hear any hard drive activity, just all the fans, case, psu, and cpu.
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February 22, 2010 12:43:40 AM

About to do the paperclip trick, I did realize, even as the fans pulse and shut on and off, the led on the mobo stays lit.
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a c 246 ) Power supply
February 22, 2010 12:45:28 AM

It's Alive!
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February 22, 2010 12:53:19 AM

Paperclip isn't doing anything : /
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February 22, 2010 1:08:49 AM

Do you have an older system to test your PSU with? It sounds like your PSU may not be dead after all. It may be something else that has failed (eg RAM and that is why i suggested to remove it and resit it.) and causing the system not to boot. If you remove the RAM or VGA does the mobo produce any sounds? (assuming you have a speaker somewhere connected)
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February 22, 2010 1:12:20 AM

Cleared the cmos, reset the ram, no dice. Officially dead then?
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February 22, 2010 3:05:44 AM

I would try it in another rig if you have, an older one. Also test the outputs with a multimeter if you have one or one of those PSU testers. Since there is some power coming out of it i would consider something else is wrong. Did you try removing the VGA and power on and see if you get any beeps? I would also try an isolation test. This is used to detect any shorts in the box; hence you remove all your hardware from the case, put in on a cardbox (we usually use the motherboard box and only use the absolutely necessary hardware (CPU, RAM, VGA) one at a time and see if you get any results.
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February 22, 2010 3:36:58 AM

No other rig, isolated the pieces I can. I think that several pins on the main rail are still hot, and some are not. I'm just going to pick up a new psu, the one I said earlier. If that isn't the problem, I'll just send it back.

Edit: Just wanted to say thanks for all the help, I'll try and update this thread when I get it fixed, it might be a while, gotta put together some cash...
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February 22, 2010 11:29:37 PM

Good luck my friend, let us know how you go.
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