OptiPlex 7040M Owner's Manual

Diagnostic power LED codes

Table 1. Diagnostic power LED codesThe following table describes the power LED light possible causes and troubleshooting steps for the causes:
Power LED light status	Possible cause	Troubleshooting steps
Off	The computer is either turned off or is not receiving power or in Hibernation mode.	Re-seat the power cable in the power connector on the back of the computer and the electrical outlet. If the computer is plugged into a power strip, ensure that the power strip is plugged into an electrical outlet and is turned on. Also, bypass power protection devices, power strips, and power extension cables to verify that the computer turns on properly. Ensure the electrical outlet is working by testing it with another device, such as a lamp.
Steady/blinking amber	Computer fails to complete POST or processor failure.	Remove and reinstall any cards. Remove and reinstall the graphics card, if applicable. Ensure the power cable is connected to the system board and processor.
Slow Blinking white light	Computer is in sleep mode.	Press the power button to bring the computer out of the sleep mode. Ensure all power cables are securely connected to the system board. Ensure the main power cable and front panel cable are connected to the system board.
Steady white	The computer is fully functional and in the On state.	If the computer is not responding, do the following: Ensure the display is connected and turned on. If the display is connected and turned on, listen for a beep code.