Dell Latitude E6420 (Early 2011) - Manual (Page 142)

Appearance Description Next Step
Blinki
ng
Off Blinki
ng
USB controller
error
Unplug the USB device (if any)
Solid Blinki
ng
Blinki
ng
No SODIMMs are
installed
1. Install supported memory
modules.
2. If memory is already present,
re-seat the module(s) one at a
time in each slot.
3. Try known good memory from
another computer or replace
the memory.
4. Replace the system board.
Blinki
ng
Solid Blinki
ng
Display panel
error
1. Re-seat the display cable.
2. Replace the display panel.
3. Replace the video card/
system board.
Off Blinki
ng
Blinki
ng
Modem error
1. Re-seat the modem.
2. Replace the modem.
3. Replace the system board.
Battery Status Lights
If the computer is connected to an electrical outlet, the battery light operates as
follows:
• 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.
• Blue light on — Battery in charge mode with AC adapter present.
142