Take the 2-minute tour ×
Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

I did a test boot with just the CPU and power supply hooked up to the motherboard. I tried to short the 2 power pins on the motherboard, but that didn't work. However, when I shorted all of the pins, the fans spun up and I got a POST beep. I proceeded to put everything in the case and power it on. However, it doesn't power on when I press the power button on the case. I have the power cords from the case plugged in, as well as the reset and HDD LED cords. Any ideas on why it's not booting?

No fans ever spin up fully, however one of the case fans kind of jolts about 3/4 times that I press the power on button on the case.

share|improve this question
    
Do this as a small test. This is totally safe. Anything outside the PSU Box is DC and not high voltage or current. If you're worried you can do this(sticking the paperclip in) while no power goes to the PSU. Take a paperclip, bend it, stick it so one end goes in the green and one end goes in a black. That should turn the power supply on. You can do this when the power supply is not connected to the motherboard. Does it go on constantly? Connect it to a fan, does it move a fan? (I suppose it should move the fan) –  barlop Mar 17 '12 at 5:26
    
Is this a rebuilt computer or a new one? As in, are there any parts that are older that may need replacing? –  Christopher Chipps Mar 17 '12 at 5:27
    
@barlop I did that. It worked. ||| Christopher: it's a new build. –  Isaiah Bugarin Mar 17 '12 at 5:29
    
In your Q you mention that you shorted all the pins. How? What did you do to do that? Try shorting all the pins again, does it go on consistently? Narrow down what pins need to be shorted to get it on consistently. Maybe not all need to be shorted. Maybe you connected the power on button to the wrong pins. Check the motherboard manual for the pin numbers and which to connect it to –  barlop Mar 17 '12 at 5:30
    
I just layed a screwdriver over all of them. I'm trying to figure out which pins work now. –  Isaiah Bugarin Mar 17 '12 at 5:32
show 10 more comments

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Browse other questions tagged or ask your own question.