Dell Precision T7400 (Late 2007) - Manual (Page 100)

100 Troubleshooting
C H E C K T H E N E TW O R K CA BLE C O N N E CT O R — Ensure that the network cable is firmly
inserted into the network connector on the back of the computer and the network
jack.
C
H E C K T H E N E TW O R K L I G H T S O N T H E BA CK O F T H E C O M PU T ER — If the link
integrity light is off (see "Controls and Lights" on page 32), no network
communication is occurring. Replace the network cable.
R
E ST A R T T H E CO M P U T E R A N D L O G O N T O T H E N E T W O R K A G A I N
C H E C K Y O U R N E T W O R K S E T T I N G S — 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.
R
U N T H E H A R D W A R E T R O U B L E S H O O T E R — See "Troubleshooting Software and
Hardware Problems in the Microsoft ® Windows ® XP and Microsoft Windows Vista™
Operating Systems" on page 131.
Power Problems
CAUTION: Before you begin any of the procedures in this section, follow the
safety instructions in the Product Information Guide.
I F T H E P O WE R L I G H T I S G RE E N A N D T H E C O M PU T E R I S N O T R ES P O N D I N G — See
"Diagnostic Lights" on page 105.
I
F T H E P O WE R L I G H T I S B L I N K I N G G RE E N — The computer is in standby mode.
Press a key on the keyboard, move the mouse, or press the power button to resume
normal operation.
I
F T H E P O WE R L I G H T I S O F F — The computer is either turned off or is not receiving
power.
• Reseat the power cable in the power connector on the back of the computer and the
electrical outlet.
• Bypass power strips, power extension cables, and other power protection devices to
verify that the computer turns on properly.
• Ensure that any power strips being used are plugged into an electrical outlet and are
turned on.
• Ensure that the electrical outlet is working by testing it with another device, such as a
lamp.
• Ensure that the main power cable and front panel cable are securely connected to the
system board (see "System Board Components" on page 27).
I F T H E P O WE R L I G H T I S B L I N K I N G A MB E R — The computer is receiving electrical
power, but an internal power problem may exist.