If, after following the steps in the sections above, your computer still receives no power, the power supply may have failed.
Bad power supply, button, power board, or inverter
If, after you've added new hardware, the computer turns on but is not beeping and the monitor isn't displaying anything, see: POST troubleshooting steps. You can also purchase a new power cable online. If you don't have another power cable to test with, see if a friend or a family member has one you can borrow. Verify the cable supplying power to your computer is not bad or damaged, by swapping it out for another one. If connecting the computer directly to the wall outlet still does not work, verify the outlet works by connecting another electrical device. If you have a power strip (surge protector) or UPS (uninterruptible power supply), disconnect the computer power cord from it and connect the cord directly to the wall outlet. If it appears to be connected correctly, disconnect and reconnect both ends of the power cord to ensure the cable is not loose. It may seem obvious, but verify the power cord is connected to the back of the computer and plugged into a power outlet. If the computer turns on but doesn't pass a POST, sounds a beep code, or isn't showing any picture on the display, see: POST troubleshooting steps.
