Sign in with
Sign up | Sign in
Your question

Computer won't turn on. Power supply is okay. Is the motherboard bad?

Last response: in Motherboards
Share
January 11, 2010 11:30:26 PM

I'm going through the steps in this tutorial (http://pcsupport.about.com/od/findbysymptom/ht/nopowert...) to deal with a system that will not turn on. I got past the power supply, where I managed to test all of the pins for the proper levels. I didn't check the power button because I'm afraid of hitting the wrong pins and damaging my board, although I will if I have to.

My next step was to check my motherboard by buying a POST card, but I'm hesitant if there is another way or if buying one will put me out more than it's worth. Is there anything else I can check? Is buying a POST card worth it for fixing one system?

BTW the board is an Asus M2N MX SE.
a b ) Power supply
a b V Motherboard
January 12, 2010 12:02:51 AM

Unplug everything except the CPU/HSF, PSU, 1 stick of RAM, and the front panel power switch. Connect your monitor to your onboard video. Everything else can be disconnected.

Try powering on. Do you hear any beeps?
January 12, 2010 12:22:58 AM

When I flick the PSU switch, the green light on the motherboard turns on. When I hit the front panel power switch, the CPU fan starts to spin but then stops. The PSU fan never seems to kick on, although when I was jumping the pin, it seemed okay to me.
Related resources
a b ) Power supply
a b V Motherboard
January 12, 2010 12:56:40 AM

I don’t think that a Post card will give you any meaningful information, so I would not buy one just to test this system, the money would be much better spent on a new power supply as this is probably the fault and if it isn’t then you have a spare for when it does go faulty in a few years time.
January 12, 2010 1:03:09 AM

pjmelect said:
I don’t think that a Post card will give you any meaningful information, so I would not buy one just to test this system, the money would be much better spent on a new power supply as this is probably the fault and if it isn’t then you have a spare for when it does go faulty in a few years time.


Well, when I tested the PSU, I think I followed the tutorial fairly well. All of the pins are within range. But I'm new to this so I might have done something wrong.. Are there more thorough tests one can do?
a b ) Power supply
a b V Motherboard
January 12, 2010 1:03:10 AM

Try unplugging the monitor in addition to what is already unplugged.
January 12, 2010 1:04:41 AM

aford10 said:
Try unplugging the monitor in addition to what is already unplugged.


Nah, still the same as before..
a b ) Power supply
a b V Motherboard
January 12, 2010 1:07:53 AM

If you can borrow someone's PSU, that'd be a good next step.
January 12, 2010 1:22:01 AM

aford10 said:
If you can borrow someone's PSU, that'd be a good next step.


Yeah, that's probably not going to happen. I'm very much a loner :/  I'm debating if buying a new PSU is worth it.. And what to do if that doesn't hep.. It would be the second one I bought today!
a b ) Power supply
a b V Motherboard
January 12, 2010 1:52:11 AM

What model is the old and new PSU? What kind of video card?

Make sure the 4/8 pin CPU power is plugged in.

Do you have a motherboard speaker?

Randomly buying parts isn't the best way to tackle this. There are some ways to help narrow it down.
Anonymous
January 12, 2010 5:02:34 AM

If you want to test if the motherboard is working. ( you need a motherboard speaker) Take out all of your ram then turn it on if you hear a beep then your motherboard is ok if you don't then your motherboard has broken.
This worked for me and I went out and got a new motherboard then it was fine.
hope this helps
from
Jordan
a b V Motherboard
January 12, 2010 12:38:23 PM

I am reading this, and I hear you say that you do not want to try to start the board by shorting across the 2 power pins. However, you state that you are certain the power supply is not bad, because you have tested each of the power supply leads with a tester. Your statements lead me to believe that your assessment of your PSU may not be conclusive.

A motherboard speaker, so you can listen to beep codes, is a must for troubleshooting these things. You can buy one for like $5.
January 12, 2010 3:14:07 PM

aford10 said:
What model is the old and new PSU? What kind of video card?

Make sure the 4/8 pin CPU power is plugged in.

Do you have a motherboard speaker?

Randomly buying parts isn't the best way to tackle this. There are some ways to help narrow it down.


Sorry for the confusion, yesterday I ordered a new PSU for another system, not this one..

The videocard is a GeForce 7200 GS. The 4 pin CPU cable is plugged in. I checked with the multimeter yesterday and it seemed okay. A far as a mother board speaker, I think I've heard it beep before, but I can't quite remember.
January 12, 2010 3:21:51 PM

aford10 said:
Look near your front panel wiring on the motherboard. The motherboard speaker will look like this
http://img.auctiva.com/imgdata/1/3/1/4/5/3/2/webimg/315...

If you don't see something that looks like that, you may want to get one.


Nah, I don't have one.. I'll probably have to go downtown and pick one up today.
January 12, 2010 3:24:43 PM

jitpublisher said:
I am reading this, and I hear you say that you do not want to try to start the board by shorting across the 2 power pins. However, you state that you are certain the power supply is not bad, because you have tested each of the power supply leads with a tester. Your statements lead me to believe that your assessment of your PSU may not be conclusive.

A motherboard speaker, so you can listen to beep codes, is a must for troubleshooting these things. You can buy one for like $5.


I followed this tutorial (http://pcsupport.about.com/od/toolsofthetrade/ht/power-...). Checked the motherboard and CPU pins. I don't have a hard drive connected to this machine so there were no others to check. But like I said I'm new to this so I might have made a mistake somewhere, so might try it again, going through it more carefully.
January 12, 2010 4:01:24 PM


Quote:
Nah, I don't have one.. I'll probably have to go downtown and pick one up today.


Looks like none of the shops downtown have any. I ordered one online, so I won't be able to respond until it shows up in the mail. For now, thanks for all your help aford10.
a b ) Power supply
a b V Motherboard
January 12, 2010 4:30:58 PM

No problem. Just let us know when it shows up.
January 17, 2010 5:04:27 PM

Here is a simple thing that might help. I thought I had a motherboard issue similar to yours, no signs of life except fans. Change the clock battery. I did this and my computer started right up. It's funny how no one seems to come up with that answer. ASUS was ready to RMA mine, but I found my own solution. Hope it's not too late to help :bounce:  .
January 19, 2010 2:39:41 AM

I got my motherboard speaker in the mail on Friday and decided I'd try it out right now. I downloaded the manual for the motherboard and I think I have the right pins.. I turned it on and.. nothing. No beeps. I pulled it out and flipped it around and still nothing. I'm going to look up the clock battery and give that a shot.
January 4, 2011 7:44:16 PM

did changing the clock battery work?

Have similar problem,PSU tests ok when isolated,but PC wont turn on when connected to mobo and peripherals




robinhoode said:
I got my motherboard speaker in the mail on Friday and decided I'd try it out right now. I downloaded the manual for the motherboard and I think I have the right pins.. I turned it on and.. nothing. No beeps. I pulled it out and flipped it around and still nothing. I'm going to look up the clock battery and give that a shot.





January 5, 2011 6:42:17 AM

I had a similar problem but i had to take out the graphics card and run start-up on internal motherboard display. Try that
April 10, 2011 9:07:18 PM

kastor900 said:
I had a similar problem but i had to take out the graphics card and run start-up on internal motherboard display. Try that



@kastor900

Where exactly do you think the internal MoBo display wille be situated on a Asus m2n -sli de luxe.

I personally do not think there is one on this MoBo, so what do you suggest instead?
February 6, 2013 5:08:55 PM

Had the exact same problem, press the power button, can see the cpu fan spin and then nothing. Swapped out PSU, RAM, CPU, and removed video card. Finally, I change the CMOS battery and that worked! Glad it wasn't the motherboard and I had lots of spare hardware to swap in! :) 
a b V Motherboard
February 6, 2013 6:16:21 PM

robinhoode said:
I'm going through the steps in this tutorial (http://pcsupport.about.com/od/findbysymptom/ht/nopowert...) to deal with a system that will not turn on. I got past the power supply, where I managed to test all of the pins for the proper levels. I didn't check the power button because I'm afraid of hitting the wrong pins and damaging my board, although I will if I have to.

My next step was to check my motherboard by buying a POST card, but I'm hesitant if there is another way or if buying one will put me out more than it's worth. Is there anything else I can check? Is buying a POST card worth it for fixing one system?

BTW the board is an Asus M2N MX SE.


It could be that the heatsink fan is not properly seated on the CPU or that there is not enough thermal paste (also, too much thermal paste will not allow heat transfer through to the heatsink).

If the PSU is less then 300 watts then that could be a problem.
March 26, 2013 11:19:27 AM

I had similar (not exactly same) but similar, and I solved this way:

MY COMPUTER WAS NOT TURN IT ON- AT ALL

- I took cables away (every cable) from the mobo
- After that -no cables connected except the 24 pin- I connected the power supply and turn it on and it turned on!
- I realize then that I have a short circuit problem-
- I put back each of the cables- one by one, and at same time turning on the PC to see where the problem was.
- When it was the time to connect one of the cables to the mobo I turn the PC on but it did not, so I realize that it was the problem- (one of the cables had short circuit)
- That small cable was the big problem, and was only a led cable -not so important for the PC to work-
- So I disconnected that cable and not used anymore- and my PC is fine now.

SO THE LESSON is: when you install cables in the MOBO I believe you have to be very careful- cause can cause a short circuit. And in order to diagnose properly you have to do it ONE BY ONE step.
April 20, 2013 2:58:16 AM

there are 2 posibilities, faulty ram on try removing the bios battery

May 15, 2013 11:28:50 AM

On my new build my problem was my 600 watt power supply was not enough to power my new motherboard... Make sure your power supply is good enough.
November 29, 2013 12:56:42 AM

I have a similar issue but none of these results worked so far.. What happened was the breaker on the house popped and the computer shut off and when we reset the breaker the computer wouldn't turn on, so i took out the PSU and tested it and it turns out it was fried so i got another spare PSU i had from a older version of the same computer just has a little more amps but it will not start when i hook it up to my mobo.. i did a short to manually start it with everything but the mobo and it seems to turn on fine but as soon as i try starting up the computer it will not turn on.. Any help?
!