Dell T3400 manual Diagnostic Lights, Diagnostic Light Codes During Post, 100, Light Pattern

–Ensure that the processor power cable is securely connected to the system board (see "System Board Components" on page 148).

•If the power light is steady amber, a device may be malfunctioning or incorrectly installed.

–Remove and then reinstall the memory modules (see "Memory" on page 157).

–Remove and then reinstall any cards (see "Cards" on page 162).

•Eliminate interference. Some possible causes of interference are:

–Power, keyboard, and mouse extension cables

–Too many devices on a power strip

–Multiple power strips connected to the same electrical outlet

Diagnostic Lights

CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.

To help troubleshoot a problem, your computer has four lights labeled 1, 2, 3, and 4 on the front panel (see "Front View (Tower Orientation)" on page 21 or "Front View (Desktop Orientation)" on page 25). When the computer starts normally, the lights flash, and then turn off. If the computer malfunctions, use the sequence of the lights to help identify the problem.

NOTE: After the computer completes POST, all four lights turn off before booting to the operating system.

Diagnostic Light Codes During POST

Light Pattern Problem Description Suggested Resolution

The computer is in a normal off condition or a possible pre-BIOS failure has occurred.

Plug the computer into a working electrical outlet and press the power button.

100

Troubleshooting Tools