Tom's Hardware > Forum > CPU & Components > Power Supplies, PC Cases & Case Mods > PSU problem? I think?
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zlfleroy   09-17-2008 at 06:11:58 AM

So today I got in my EVGA Ge Force 9800GT and a generic 400w power supply just to skim by on bare minimum until I can afford a nicer PSU. I took out my old card and then removed my old PSU and replaced it with the new one being sure to put all wires in their designated brackets and then put in the EVGA which is a HUGE card... I hooked up the monitor plugged in the power cable pushed the power button AND nothing. Not a single solemn noise. I checked all the wires and even replaced both the PSU and the GPU with the old ones and same problem! power button doesn't crank up the system!! HELP ME?!

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hnml24   09-17-2008 at 06:33:36 AM
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Hi zlfleroy,

I'm not sure your PSU can handle this card..

you should have at least 500W and dont forget, it depends how many devices(HD/ CD DRIVERS/FANS/Lights etc') you've got ..

Noam

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zlfleroy   09-17-2008 at 06:45:19 AM
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I checked it out and EVGA is saying 400w is minimum and even so that doesnt explain why the old setup isnt working either. Cheers for you input though mate.

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stuart72   09-17-2008 at 01:59:10 PM
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I might be being obvious, but

Check the power lead to the PC
Check that the power switch is still connected to the mainboard header, they are very easy to knock loose.

Do you have access to another mainboard to test the PSU's you have?

failing that what are the specs of the PC?

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hnml24   09-17-2008 at 07:23:26 PM
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this card has a seprae connection for power.. it has a 6 pin connector..
it suppose to be linked .. and I believe that 400 W is for a sysem that is clean with nothing on but a avrage PC.
that what im thinking..

I've got the NX8800GT and I bought a cheap PSU (EZCOOL 500) and it works great..
i still think the problem is the PSU

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bobbknight   09-17-2008 at 07:45:19 PM
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First check if the PSU is working.
On the 24 pin power connector short the green wire to the black wire next to it. The PSU fan should come on, if it does cool. Now turn it off running the PSU without a load will burn it out. A fast check is ok but don't run it for more that a few seconds.
Dose it run? If so you got power. Hook it up and make sure all connections are correct. Now turn on your computer does it run?

Make sure the power switch is on the right part of the header, on the motherboard.

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MrCommunistGen   09-17-2008 at 07:59:08 PM
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If the PSU is an old design it may not have nearly enough 12v current to power a modern system.

-mcg

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swat565   09-17-2008 at 08:46:00 PM
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Make sure when you took apart the PSU you made sure to attack the 4 pin connector to the motherboar its normaly right next to the CPU fan. Also you could have connected something wrong creating a dead short...which if thats the case most likely something is dead.

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zlfleroy   09-18-2008 at 04:56:29 AM
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I checked everything and the PSU is totally non responsive. Someone on another site said that I may have fried the mobo but I think if I'd done that I would smell/see/hear something and I did not. I think what I'm going to do is get a case/PSU combo from newegg. It was the next step I was gonna take anyways.

http://www.newegg.com/Product/Prod [...] 6883107696

That is the EXACT computer I have (LCD and all) and I need a case that I can simply swap everything into and plug up and go. I'd prefer newegg because I deal with them a lot but if anyone can help me find a case/psu deal I would appreciate and thank you guys so much for your help. This site is really great and friendly!

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