How to know Motherboard is Defective or not ?

[RAIDEN]

Hello , How do I know if a motherboard is Defective ? What are the elements that make it no longer works? how to Check the For the Sign and symptoms to findout that board is defective actually my pc is not starting and i dont know how to findout which part is defective , as i dont want to spend so much as motherboard is 10 year old , instead i would purchase a new pease give some good suggestion Thank you in advance

[Oswald]

Definently. Start taking things out of the machine, one by one, and see if you can get anywhere. The CD will always work because once it has power, it'll be able to play CDs as this is a built in function of the device. If you do have power to some devices, though, and not to others, I'd start by getting rid of the dead devices. One other long shot is the CMOS battery - try replacing it, it could be totally dead and can cause this type of problem sometimes.

[Baltazar]

I would examine the board carefully for any evidence of leaking or bulging capacitors. If any are found, either toss it or replace them all. If not, give it a HDD and an OS, find out if it runs reliably once booted, and decide it's future from there...

[MattyBoy]

Simple way to find out dead motherboard use motherboard diagnostic card that's available in market 2or4 digit diagnostic card will show you post code of routine testing motherboard also I know this sounds crazy but change out the mobo battery. I just read an article how this is one of the most common problems that produce symptoms of a dying mobo. Hey, it is cheaper than a new mobo.

[Russell]

What is the motherboard doing (or not doing)? Is it totally refusing to
power up? If so, try stripping it down to the bare minimum: motherboard,
CPU+heatsink, RAM, power supply, graphics card, video cable to monitor.
That means no hard drive, no floppy drive, no cables, no keyboard, no
mouse, no PCI cards, etc. If you can, take the motherboard out of the
case and put it on a flat, nonconducting surface, like a piece of
cardboard or a wooden table.

Connect the power cables to the motherboard, but do not connect the 50
million little connectors to the case. Locate the two pins on the
motherboard that connect to the case power button. Instead of connecting
the power button cable to those pins, touch the head of a screwdriver to
those pins. That will take the place of the power button for now.

If the computer still does not start, try removing and reinstalling the
CPU, RAM, and graphics card. It could be that one of those is loose.
Now that the computer is out of the case, you should have easy access to
those sockets.

If the computer still does not start, make sure that the "Clear CMOS"
jumper is set to the "Normal" position. Some manufacturers ship
motherboards with this jumper in the "Clear" position to preserve battery
life. I do not believe FIC does this, but it is easy enough to check.

Here are some additional steps just in case:

The surest way I can determine if the motherboard is bad is to install (known good) basic components and see if the system will fire up.

Basic setup for testing:

CPU
Motherboard
RAM
Video(Card) & Monitor
Power Supply
Keyboard

Many motherboard these days also come with some form of self diagnostics built right in (in addition to the BIOS beep codes). Either with LEDs, or on screen codes, I've even run across a motherboard that will "talk".

source- yahoo answer