Brand: Dell
Category: Laptop
Document Type: Manual
Language: EN
Available Languages: EN , ES
Manual for Latitude 5420/ E5420/ E5420m
Uploaded: Sept. 12, 2025, 4:17 a.m.
Warranty Information
Refer to the safety information shipped with your computer for warranty details.
Before Working Inside Your Computer: Ensure work surface is clean, turn off computer, undock if applicable, disconnect all cables and electrical outlets. Close display, turn computer upside down, and remove main battery. Turn computer top-side up, open display, and press power button to ground. Remove any ExpressCards or Smart Cards. Always ground yourself by touching an unpainted metal surface.
Turning Off Your Computer: Save and close all files. Shut down the operating system through Start Menu (Windows Vista) or Start > Turn Off Computer (Windows XP). If necessary, press and hold the power button for 4 seconds.
Turning Off Your Computer: Save and close all files. Shut down the operating system through Start Menu (Windows Vista) or Start > Turn Off Computer (Windows XP). If necessary, press and hold the power button for 4 seconds.
Troubleshooting and error codes
| Device Status Lights | Description |
|---|---|
| Power Button Light | Turns on when you turn on the computer and blinks when the computer is in a power management mode. |
| Hard Drive Activity Light | Turns on when the computer reads or writes data. |
| Battery Light | Turns on steadily or blinks to indicate battery charge status. |
| Wireless Networking Light | Turns on when wireless networking is enabled. |
| Bluetooth Light | Turns on when a card with Bluetooth wireless technology is enabled. To turn off only the Bluetooth wireless technology function, right-click the icon in the system tray and select Disable Bluetooth Radio. |
| Battery Light Behavior (connected to electrical outlet) | Status |
|---|---|
| Alternately blinking amber light and blue light | An unauthenticated or unsupported non-Dell AC adapter is attached to your laptop. |
| Alternately blinking amber light with steady blue light | Temporary battery failure with AC adapter present. |
| Constantly blinking amber light | Fatal battery failure with AC adapter present. |
| Light off | Battery in full charge mode with AC adapter present. |
| Solid white light on | Battery in charge mode with AC adapter present. |
| Keyboard Lights | Status |
|---|---|
| Numeric Keypad Light (9) | Turns on when the numeric keypad is enabled. |
| Caps Lock Light (A) | Turns on when the Caps Lock function is enabled. |
| Scroll Lock Light (down arrow) | Turns on when the Scroll Lock function is enabled. |