Bad caps

Many electronic gadgets die and become unusable. The reason is often "bad caps", electrolytic capacitors that are failing. In some cases this is impossible to see, but in many cases a bad cap is physically damaged. A probably good cap:

Some bad ones:

These pictures were taken in a computer power supply. The computer were malfunctioning with bluescreens and the USB voltage was about 3.5 volts instead of the 5 volts it should be.