|Is the "dead computer" a laptop or netbook, or a desktop computer ? |
If it's a laptop or netbook, ask the owner if any of these things apply:
Since it last worked properly, have you, or is it possible anyone else who has had physical access to this computer - dropped it, or otherwise subjected it to a physical jolt ?
- spilled liquiid on it, or exposed it to liquid such as rain, or sprayed it with liquid ?
Has there been a power failure event, or lightning strikes in your region, since it last worked properly, while the AC adapter was plugged in ?
Any of those things is a lot more likely to cause damage to your computer that requires that something inside of it must be replaced.
If it's a desktop computer, try connecting the power supply from a working computer.