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How do I tell if the motherboard is bad

c7c4c7 asked
Last Modified: 2013-12-11
I have an ASUS K8N-VM motherboard that I added memory to, the machine now will not boot, beep or show the ASUS splash screen.  I have several of these machine configured exactly tthe same.  The power supplies have a history of dying, I need to know if the motherboard is dead or if the power supply could be causing the problem.

I have tried to boot from floppy and CD as well with no luck.

By the way I took out the new memory and reinstalled the old, I have the same problem.
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Does the PS work in another machine? Also you could get a voltmeter and turn on the PS and check to see if one of your HD connectors has output. You will need to leave the main connector plugged in to act as a load. You can also measure out the main connector on the board by slipping the volt meter leads into the pins to get a voltage.

Also, check to make sure you didnt accidentally hit the 220V switch on the back of the PS if its a universal . If it is throw it on 115v or 110v; whichever it might be.

Next move if this doesn't work would be to open the PS up and measure voltage across the fuse leads. Be careful when your in there as those caps will have some good DC juice in them, and if they aren't discharging right away, might just discharge into your finger.

If that doesnt not work it's p/b the mobo. Pull the battery out of it for kicks and giggles and see what that does.
Top Expert 2012

It is almost impossible to test a motherboard, due to the complexity of the components mounted on it.  Only very obvious things like burn marks, swollen or burst capacitors or burnt smells might provide clues that it isn't working normally.  The alternative is to test out the power supply and eliminate it as the cause.  You could take one out of a working machine and try it in this one, if it has sufficient power.


Probably should have said this in the original post, all of the fans work and the status light on the motherboard is on.

BUT does that mean that the motherboard is getting enough juice?

Does the HD spin up? I assume the CDROM works since your were able to eject it. Sounds mobo to me. Did you ground yourself and the machine prior to installing the memory? Perhaps some static discharge got released when you installed the memory, esp. if your on a carpet.
Top Expert 2012

>BUT does that mean that the motherboard is getting enough juice?

In a word, no.  There could be enough current to light up lights and spin fans, yet not enough to trigger the cpu into start.
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I'm not real sure why this worked.  After removing everything and then powering up the machine it showed signs of life and began to beep.  I reinstalled the memory and the hard drive and the machine booted successfully.

If you have any opinions to why this worked, I'd like to know.  I did blow the chasis out as well before starting to reinstall things
Distinguished Expert 2019

it can be bad contacts, or a power supply in protect mode

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