Dell Latitude E6220 (Mid 2011) - Manual (Page 111)

Diagnostic LED Error Description
Solid Solid The microcontroller is handing control of
Blinking the system to the processor. This code
persists if no processor is detected.
Solid Blinking Solid The memory has encountered an error.
Blinking Blinking Blinking A system board component is faulty.
Blinking Blinking Solid The video card is preventing the system
from completing POST.
Blinking Blinking Off The keyboard is preventing the system
from completing POST.
Blinking Off Blinking The USB controller encountered a problem
during initialization.
Solid Blinking Blinking No SODIMMs are installed.
Blinking Solid Blinking The LCD encountered a problem during
initialization.
Off Blinking Blinking The modem is preventing the system from
completing POST.
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