Dell OptiPlex 745c (Early 2007) - Manual (Page 97)

Power Problems
Fill out the Diagnostics Checklist as you complete these checks.
Printer Problems
Fill out the Diagnostics Checklist as you complete these checks.
Check the network cable connector — Ensure that the network cable is firmly inserted into both the network connector on the back of the
computer and the network jack.
Check the network lights on the front or back of the computer depending on system chassis type. — No connection speed light indicates
that no network communication exists. Replace the network cable.
Restart the computer and log on to the network again
Check your network settings — Contact your network administrator or the person who set up your network to verify that your network
settings are correct and that the network is functioning.
Check for software and hardware conflicts — See Resolving Software and Hardware Incompatibilities .
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide.
If the power light is green and the computer is not responding — See Diagnostic Lights .
If the power light is blinking green — The computer is in standby mode. Press a key on the keyboard or move the mouse to resume
normal operation.
If the power light is off — The computer is either turned off or is not receiving power.
l Reseat the power cable into both the power connector on the back of the computer and the electrical outlet.
l If the computer is plugged into a power strip, ensure that the power strip is plugged into an electrical outlet and that the power strip
is turned on. Also bypass power protection devices, power strips, and power extension cables to verify that the computer turns on
properly.
l Ensure that the electrical outlet is working by testing it with another device, such as a lamp.
l Ensure that the main power cable and front panel cable are securely connected to the system board.
If the power light is amber and green or steady amber — A device might be malfunctioning or incorrectly installed.
l Remove and then reinstall the memory modules.
l Remove and then reinstall any cards.
l Remove and then reinstall the graphics card, if applicable.
If the power light is blinking amber —
The computer is receiving electrical power, but an internal power problem might exist.
l Ensure that the voltage selection switch is set to match the AC power at your location (if applicable).
l Ensure that the processor power cable is securely connected to the system board.
Eliminate interference — Some possible causes of interference are:
l Power, keyboard, and mouse extension cables
l Too many devices on a power strip
l Multiple power strips connected to the same electrical outlet