The motherboard is the heart of a computer. Motherboard repair or replacement is usually very expensive. Detecting the difference between a failing or failed motherboard and other failing components can be difficult. This difficulty arises because all the components of a computer are plugged into the motherboard. Thus, if you are having trouble seeing the screen, it could be that the motherboard is failing or that the video card is failing. For this reason, any part of the computer failing can be a sign of a motherboard failure.

Common mother board failure symptoms: 

Laptop over heating. 

Dead laptop or laptop won't turn on.

Laptop is working very slowly.

Laptop screen goes dim.

Laptop Hangs, freeze or shutdown while in use.

No LED light when you press the power button.

Laptop rebooting constantly.