If your computer will not start, meaning it seems like it is dead or partially dead, then you probably have a bad power supply. There are, of course, other components that can cause a no power issue, but usually we need to start at the source and check the power supply first. The power supply is at the rear of the PC, usually near the top of the case, and it is what gets plugged into the wall or power strip. If you open the case, you will notice the power supply is more complex inside. You will have a main power connector that is either a 20-pin or a 24-pin. You will also have multiple connectors that go to various components in the case, like the hard drive, optical drives and sometimes even the video card.
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