Dell Vostro 330 (Early 2011) - Manual (Page 57)

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Dell Vostro 330 Owner's Manual
Diagnostic Power LED Codes
Power LED Light Status Power State
Power is off or the system is in an S4 (hibernate) or S5 (Powered
Off) power state. LED is blank.
The computer is in power-on state.
The system board cannot start initialization. There may be an issue
with the system board, memory, processor or the power supply.
The system board cannot start initialization or in an S3 (Sleep state)
power state. There is a power problem, a device may be
malfunctioning or incorrectly installed.