The motherboard is the most important part of the computer. It connects all other components like CPU, RAM, HARD Drive etc.
One of the most common faults with the motherboards is faulty capacitors. Sometimes it is very difficult to find faulty capacitor so it requires a lot of patient and persistence.
Another common fault is fault caused due to overheating. Laptops are enclosed in small casings and this makes it very difficult for the fans inside to keep it on normal working temperature so it doesn't overheat. Especially when the computer is blocked with dust or has a gaming graphics card the overheating is a major issue. When the computer works on very high temperatures all the time this damages to solder joints inside and at the end it will not show anything on the screen. The last few years there has been a great increase on laptop faults with the Nvidia Graphics Chip and this is caused by this constant overheating.
Fluid / liquid spillages damage the motherboard as well causing many short circuits between the elements inside causing an overload and damage. When this accident happens remove the battery and the charger immediately and take it to a laptops specialist for an inside cleanup and this way there is a very good chance your laptop can be saved.