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

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?

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.

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?

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

Nah, still the same as before..

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!

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.

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

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.

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.

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.

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.

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.

No problem. Just let us know when it shows up.

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   .

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.

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

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?

Sometimes, windows system files such as bootmgr/ntldr is missing can due to your computer won't boot, you can download Fix Genius from http://lnkd.in/CcR755 to check and repari the losing file.

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!  

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.

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.

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

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.