Dell Vostro 410 (Late 2008) - Manual (Page 55)

Check the network cable connector — Ensure that the network cable is firmly inserted into the network connector on the back of the computer and the
network jack.
Check the network lights on the back of the computer — If the link integrity light (see "About Your Computer" in your Setup and Quick Reference Guide) is off,
no network communication is occurring. 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.
Run the Hardware Troubleshooter — See Hardware Troubleshooter .
Power Problems
If the power light is blue and the computer is not responding — See Power Lights .
If the power light is blinking blue — The computer is in standby mode. Press a key on the keyboard, move the mouse, or press the power button 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 in the power connector on the back of the computer and the electrical outlet.
l Bypass power strips, power extension cables, and other power protection devices to verify that the computer turns on properly.
l Ensure that any power strips being used are plugged into an electrical outlet and are turned on.
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 (see System Board Components ).
If the power light is blinking amber, beep code 3 — The computer is receiving electrical power, but a system board failure may exist.
l Ensure that the voltage selection switch is set to match the AC power at your location (if applicable).
l Ensure that all components and cables are properly installed and securely connected to the system board (see System Board Components ).
If the power light is steady amber — A device may be malfunctioning or incorrectly installed.
l Ensure that the processor power cable is securely connected to the system board power connector (POWER2) (see System Board Components ).
l Remove and then reinstall all memory modules (see Replacing or Adding a Memory Module ).
l Remove and then reinstall any expansion cards, including graphics cards (see PCI and PCI Express Cards ).
Eliminate interference — Some possible causes of interference are:
l Power, keyboard, and mouse extension cables
l Too many devices connected to the same power strip
l Multiple power strips connected to the same electrical outlet
Printer Problems
Check the printer documentation — See the printer documentation for setup and troubleshooting information.
Ensure that the printer is turned on
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions that shipped with your computer.
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions that shipped with your computer.
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions that shipped with your computer.
NOTE: If you need technical assistance for your printer, contact the printer's manufacturer.