Link to home
Start Free TrialLog in
Avatar of vargascomp
vargascomp

asked on

How do I diagnose a Dead Motherboard

I have a computer that won't boot it was shut down normaly yesterday and today it just won't start at all no error messages nothing on the screen is completely dead.  I only see a green light on the motherboard that means there is power to the motherboard.
I already replaced the power supply thinking that could be the case but still same.
Avatar of red1dev2
red1dev2

Does it sound like the computer is starting? Are the hard drives making noise?

If it does keep reading. Otherwise strip the board down to the minimum see if it posts.

This might sound stupid but did you make sure that the video card is seated correctly it is possible it became bumped lose, another thing is to try is a pci video card if it is an onboard.
Avatar of vargascomp

ASKER

I did strip to minimum and same no sounds of starting I even checked the power on switch thinking it could be bad but same no sound like booting at all.
I recognize you have replaced power supply, and also see a green light on the MotherBoard.
I see you have said there are still no sounds of starting. Does this include the sound from the Fan on the Power Supply?

Is the fan on the Power Supply actually running?

ASKER CERTIFIED SOLUTION
Avatar of Orbixx
Orbixx

Link to home
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
Start Free Trial
Not even the power supply fan or any other  this is a video and sound integrated on motherboard
I does have a speaker on th emotherboard but there are no beeps or any sound at all. I could not find and external speaker conection on the motherboard.
SOLUTION
Link to home
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
Start Free Trial
SOLUTION
Link to home
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
Start Free Trial
I tried disconecting the P1 Cable from power supply to motherboard and connecting it back and got some cpu fan spinning for couple seconds but it didn't last. but power supply fan never seen it spining and it it bran new.
Yes, that's normal. It's just the surge of power from the moment of connection. Although your motherboard is dead, it can still supply auxiliary power.
I guess I will try another power supply as a last resource to try save this motherboard.
Thank you all for your responses.
Sorry
I was just about to Say, "I regress, If you try a diff power outlet and the power supply fan still isnt moving, it could still lead to a faulty board."

So please dont go running out and purchase another PS just yet.

Do we  know the make and model of the board?



SOLUTION
Link to home
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
Start Free Trial
"I tried disconnecting the P1 Cable from power supply to motherboard and connecting it back and got some CPU fan spinning for couple seconds but it didn't last"

If that happens then its definitely the board.
you can try shorting the cmos by removing the battery for about 10 min or jumper it.
If you have bad capacitors then its likely to be dead too.
http://www.badcaps.net/pages.php?vid=5

What I'm referring to is not a classic "bad caps" case and may be a design problem. One cap in PSU overheats enough to cause circuit board damage. I've seen 2 where cap had gotten hot enough to de-solder itsel and was loose inside PSU.
I'm analysing PSU and everything looks prety much in good shape exept the board in about the middle is little bit dark spot.  it doesn't look like burned out, Generally is in good shape.
If I replace the motherboard I still got chances of replacing CPU and defenitely PSU? any advice as if better buy new computer?
In the cases I've seen, replacing motherboard and PSU was sufficient. Rest of components were OK.

"in about the middle is little bit dark spot" -- not where a cap used to be is it?
Nop I coudn't find anything missing or a significant something visual to say that was the problem.
SOLUTION
Link to home
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
Start Free Trial
If you get a new motherboard it will come with warranty .
go ahead and change the board its cheaper then a new system.
Unless the system is more than 5 years old, then a new PC is worthwhile.
I agree with willcomp, I have experienced this too with eMachines - it is the most likely case.
THANK YOU ALL FOR YOUR SUPPORT!
Is an old computer I better buy a new one.
SOLUTION: BUY NEW COMPUTER
That's always a good idea.
Dont forget to close the open question.
Why a B? What else did you want?