Troubleshooting a computer that seems to be unresponsive or unable to power up can seem a daunting task. The key to fixing computers is essentially the process of elimination. The following tips can help determine why a computer appears to be dead or fails to power up.
Obviously, one of the first things to check is whether live power is available at the wall outlet or other power source. Pull out the computer power cord and plug in a lamp, radio or other simple device. If the device used for testing works fine then move on to the computer power cord.
Ensure that the power cord is firmly plugged in to the power source and the power supply on the back of the computer. Computer power cords are for the most part standard across almost all major manufacturers. This should allow for the use and testing of an alternate power cord from your monitor or another available computer. A power cord issue is easily ruled out if the computer still does not power up.
In addition to the power button typically located on the front bezel of most computers, there may also be a power switch located on the power supply. Verify that it is in the on position. If no status lights are displayed after pressing the power button or if you do not hear the fans startup then there may be an issue with the power supply itself.
Open up the computer and check to ensure that all power supply connectors are firmly seated on the motherboard and connected peripherals. Some manufacturers include a power status light on their motherboards that remain lit even when the computer is off. If you know for sure that there is such a light and that it is not illuminated then the power supply may indeed be the issue.
If the computer is still under warranty then notify the manufacturer tech support department for additional troubleshooting and parts replacement if available. The other options would be to have your computer serviced by a computer repair shop or self repair.
A self installed replacement power supply can usually be purchased direct from the manufacturer, third party vendors or from second hand markets like eBay.
Servicing you own computer can be a great cost saver. If you can wield a screw driver and plug in small plastic connectors then you should be able to change out a failed power supply. By all means, if you have doubts about your skill level then seek professional servicing options.