If your computer won't turn on, check the "Power" button on the case.
The "Power" button on your computer is an important, yet simple, part of the machine. It works like any other simple switch, providing a current path when it is pressed and blocking current flow when it is not pressed. If your computer refuses to turn on, you may need to test the "Power" button. Most "Power" buttons will still click and feel as though they are working even if they have failed. The best way to ensure that your "Power" button is working is to use a multimeter.
Instructions
1. Unplug your PC from the wall. Remove the computer case. Unscrew the screws in the back of the case or remove the plastic connectors that hold the case together; the exact method will vary depending on the type of computer case.
2. Disconnect all power and data cables from the motherboard. Draw a diagram to remember where each cable plugs in, if necessary.
3. Find the power switch at the front of the case. Remove it from the case by using a small screwdriver to pry loose the glue that is holding it on. Locate the leads that extend from the switch; there will be two or four leads.
4. Set the multimeter to test resistance. Connect one side of the multimeter to one lead and the other side to another lead. Note the resistance reported by the multimeter.
5. Press the switch. Watch for a drop in the resistance shown on the multimeter; a drop in resistance indicates a good switch.
Tags: Power button, your computer, computer case, drop resistance, when pressed