Dell Precision T5400 User's Guide - Page 41
Power, Controls and Lights, Front panel, Back panel - blinking lights
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Controls and Lights Power light Hard-drive access light Network integrity lights Activity light Diagnostic lights Standby power light Power DC power supply Wattage Heat dissipation Voltage Backup battery Front panel: green light-blinking green in sleep state; solid green for power-on state amber light-blinking amber indicates that an internal power problem might exist; solid amber indicates that a device may be malfunctioning or incorrectly installed (see "Power Problems" on page 116) Front panel: green light - on when the computer reads data from or writes data to the hard drive. The light may also be on when a device such as the optical drive is operating. Back panel: green light for 10-Mb operation; orange light for 100-Mb operation; yellow light for a 1000-Mb (1-Gb) operation Front panel: displays solid green when a network connection is present. Back panel: yellow blinking light when there is network activity. Front panel: four lights (see "Diagnostic Lights" on page 121) AUX_PWR on the system board 875 W 1094W or 3732BTU/hour NOTE: Heat dissipation is calculated based upon the power supply wattage rating. auto-sensing power supply-90 V to 265 V at 50/60 Hz 3-V CR2032 lithium coin cell About Your Computer 41