Faulty Motherboard?

Royal Fleet

Royal Fleet

Royal Fleet

Associate
Joined
21 Nov 2007
Posts
1,064
Location
Fleet, Hampshire
I have been asked to look at a faulty computer by a friend.

The fault is this

- Plug PC in system kicks into life without pressing the start button
- All Fans spin, HDD sounds like it is being accessed
- No POST beep
- No output to screen

I have swapped the memory out and that is fine. I am suspecting that as the machine starts without pressing the start button, the Motherboard is faulty.

Has anyone experienced the same? Agree with me?
 
Could just be starting by itself because the jumper cables are incorrectly placed.

Try re-seating them.

What is the motherboard ? Does it come with an Little LCD post no. screen to help with diagnostics?

Try a clear cmos. Start it up with the bare minimum needed to get a machine to start. Make sure all cables are connected securely and all components fully seated.

Got a spare psu or graphics card you can try in case one of them is faulty?

If you have no display and if you know the motherboard model etc. and can find the manual, you can still get into bios by pressing the del key at the beginning and by looking at the manual bios screens move the appropriate keyboard keys to load fail-safe defaults and see if that will bring the screen back to life for you. Its a long shot, but I had a no display issue with an old abit motherboard years ago and by loading defaults by navigating through the bios blind the machine display kicked back into life.
 
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Motherboard is a Asus K8V-MX. There is no LCD on it.I have checked all the connectors and they seem sound.

I had discounted the PSU as it all seems to light up and move in the right way.

Also there is no POST, so I would not think I could get the BIOS to kick in any form.
 
Do you get any beeps out of the board?

IMO no POST means bad CPU or board but if you are getting some beeps it will mean something.
 
I'd remove the CPU completely. Then boot it. It should beep to inform you you have forgotten to install a CPU. If it doesn't then that coupled with the fact it's powering on by itself would point to a bad board. However It could still be PSU related. Worth swapping it out to check.

A way I used to check this kind of fault was to remove everything and power the board up, it should beep. Look at what that beep referred to usually CPU or memory first then install that component. If that component isn't the problem it'll beep for the next hardware item it tests in POST. I.e If i got a CPU beep. put the CPU in, get memory beep, put that in, get no bad VGA or other beeps then it would be memory related issues halting the POST.

Not sure how this works with newer boards as more and more complex BIOS functions are being developed.
 
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