When the computer does not show any display, there are only two possible it could happen, first:
a. If the computer can not be on, there was damage to the power supply short circuit occurred whether or entered into small animals such as lizards.
If this happens you just need to change the Power Supply that does not require a large expense.
Before Power Supply can be replaced, the following should be taken out first.
i. What type of Power Supply is used by your computer.
This is important to avoid mis-purchase your Power Supply that you can not use.
ii. Knowing your Power Supply.
Open the casing on your computer to see what kind of Power Supply is used. Refer to the description given below.
1. ATX 2O Pin usually use for Pentium 3 and 4
2. Power Suppy with SATA connector, for Dual core or AMD Plus..