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Computer starts then dies


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#1
dimi16

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Well here is my problem

I recently bought an antec 350 w power supply to replace my old one. The official name is antec SL350 smartpower. I installed everything and have found that when i start up the computer for about have a second the fans go, the mobo light turns red and then it shuts off. I am wondering what could cause this problem.

One thing i noticed is that there is a fan connector for the PSU so i tried it with that unconnected because i dont have enough fan slots on my mobo then i tried it connected to the case fan slot... the same thing happens.

I have some important files on this computer that I need to transfer so help is urgently needed.

Thanks a bunch

-Dimitri
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#2
dsenette

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try starting the machine with only the psu mobo and memory attatched...see if it goes through post. also try hooking the entire set up outside of the case on a piece of cardboard
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#3
The Skeptic

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Try to reinstall the old power supply unit if it is in operable condition. If the computer works then your new power supply is bad. If it doesn't then you have a more serious problem.
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#4
Tyger

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You may have some kind of sensor on your board or in your old supply which detects something related to the other part.
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#5
Kurt_Aust

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It may sound stupid but this reminds me of a problem I encountered earlier this year. I had just built myself a new box and was feeling rather proud of myself, at least until the computer started freezing.

Not just freezing in the OS mind you, it was also freezing in BIOS. I thought it was a bad motherboard so I took it back to the supplier, of course it worked perfectly. Took it home and froze up again.

End result, power supply. Not the one in the box but rather the line voltage. Here in Australia we are supposed to get 240V, turns out my suburb generally gets about 220V where as the motherboard supplier was getting 237V (if you're a Yank, think California).

In my case the really frustrating thing is that you can never really be sure whether a problem is power related or not.
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#6
dimi16

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well when i add the new power supply it works but that jusr isnt enough power to run my 9600xt so im stuck with onboard graphics whuich are terrible.. any suggestions?

thanks dimitri
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#7
The Skeptic

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well when i add the new power supply it works but that jusr isnt enough power to run my 9600xt so im stuck with onboard graphics whuich are terrible.. any suggestions?

thanks dimitri

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What do you mean by "I add the new power supply"? Why did you replace the old one in the first place, is it faulty? That's not clear.

A 350 w power supply is rather weak for a computer which has lots of memory, fans, powerful cpu, usb devices, heavy duty video card etc. I wouldn't buy anything below 500w. Throughout this thread Ii's impossible to understand where the problem is. It is most likely in the power supply or the video card. You have to replace each of them, temporarily, to find out where the problem is.
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