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Dell Vostro 3670 Service Manual

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Diagnostics

The computer POST (Power On Self Test) ensures that it meets the basic computer requirements and the hardware is working appropriately before the boot process begins. If the computer passes the POST, the computer continues to start in a normal mode. However, if the computer fails the POST, the computer emits a series of LED codes during the start-up. The system LED is integrated on the Power button.

The following table shows different light patterns and what they indicate.

Table 1. DiagnosticsThe following table provides the different light patterns and what they indicate.
Number of LED flashes Problem description
2 amber, 1 amber Motherboard failure
2 amber, 2 amber Motherboard, PSU or PSU Cabling failure
2 amber, 3 amber Motherboard, Memory or CPU failure
2 amber, 4 amber CMOS battery failure

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