Troubleshooting Power Supply

Symptom	Possible solution
Computer will not turn on or start.	Ensure that cables connecting the computer to the external power source are plugged in properly. When the cables connecting the computer to the external power source are plugged in properly and the wall outlet is functioning, the green power supply light on the back of the computer should be on; if the light is not on, refer to the Limited Warranty and Support Guide to contact Support. If the display (monitor) is blank, the monitor may not be properly connected. Connect the monitor to the computer, plug it in, and turn it on. Set the line voltage selection switch to the correct setting for your country/region, or refer to the Limited Warranty and Support Guide to contact Support. Test the outlet by connecting a different electrical device to the outlet. Incompatible memory (RAM) may have been installed. Reinstall the old memory to return your computer to its original state.   Reseat the hard disk drive’s data and power cables.
Invalid system disk or Non-System disk or disk error message displays.	When drive activity stops, remove the disk and press the spacebar. The computer should start up.
Computer does not turn off when the On button is pressed.	Press and hold the On button until the computer turns off.
Computer shuts down automatically.	The computer may be in an exceedingly hot environment. Let it cool down. Ensure computer air vents are not blocked and internal fan is running. Note that your computer may not have an internal fan.
Computer date and time display is incorrect	The real-time clock (RTC) battery may need to be replaced. Battery life is approximately seven years. Before replacing the battery, try resetting the date and time in your operating system by using the Control Panel. If the problem persists, replace the battery.