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How To test an ATX power supply?

Trish's Escape from Hardware Hell Help Board » Hardware » ...All the Rest » How To test an ATX power supply? « Previous Next »

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Posted on Friday, November 24, 2000 - 12:21 pm:   

I have just upgraded a system. right before I upgraded the system, i could not get it to turn on. So i figured I would just forget about it and put in the new motherboard, ram and processor. All are new. after I put it all together, nothing happens. I checked the switches/ connector pins in the motherboard. The fan on the supply does not turn. I am wondering how to test the ATX supply. I completely removed it from the couputer and plugged it in. the fan does not spin. Should the fan spin with no motherboard connected to it?
Posted on Saturday, November 25, 2000 - 2:27 pm:   

No.. atx power supplies are turned on and off by software in the mainboard. This includes the fan.

You will find that 9 times out of 10 the problem you describe is simply not the power supply.

Usually it ends up being incorrectly mounted ram and cpu. Incorrectly jumpered settings for the same, or incorrect hook up of the atx power switch.

Also, people tend to build a system and install all the parts at one time.

Remove everything buy the video card, and disconnect all drives while you trouble shoot the boot up problem.

Really double check the jumper settings, and check the mobo maker's website for manual revisions.

Now, aside from that, your Power supply could well be pooched. There is a good chance. But Im trying to show you other causes and things to try before you buy a new one. Save you some cash if I can.

In correctly seated cards, cpu, etc.. can all cause a 0 activity boot.

One trick that works in alot of cases, is to see if the fan tries to turn at all when you boot. Usually if the jumpers etc.. are set wrong, the fan will begin to turn for a split second and then die almost immediately. If this is not happening, either your power switch is set up, or you have a completely dead MOBO and power supply.

Its hard to know for sure what your problem is when I have only a short description to go by. So Im just showing you what I would check first, and rule out everything possible over the clumsy interface that is a message board.

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