Dell Precision T7400 User's Guide - Page 106
Diagnostic Lights, Power, Light, Problem Description, Suggested Resolution, Contacting Dell
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Diagnostic Lights (blinking) (blinking) Power Light blinking green green amber blinking amber Problem Description Suggested Resolution The computer is in a reduced power or "sleep" state. Use one of the appropriate methods to "wake up" the computer. See "Advanced Features" on page 35. If the problem is not resolved and you are trying to wake the computer with a USB mouse or keyboard, substitute the mouse or keyboard with a working PS/2 mouse or keyboard and then try to wake the computer. None. The system hardware appears to be operating normally. Any issues seen may be related to the operating system or software. The BIOS is not executing. Ensure that the processor is seated correctly and restart the computer (see "Processor" on page 150). If the problem is still not resolved, contact Dell for technical assistance (see "Contacting Dell" on page 287). A possible power Perform the procedure in supply or power cable "Power Problems" on failure has occurred. page 100. If the problem is still not resolved, contact Dell for technical assistance (see "Contacting Dell" on page 287). 106 Troubleshooting Tools