Indicates the presence of the main bus clock signal. If dark, the motherboard is likely not functioning at a basic level.
These should remain lit constantly. If an LED is dark, it suggests a power supply failure or a short circuit on the motherboard. Pci Pc Analyzer Manual
Most cards feature a bank of LEDs that indicate the status of critical power rails and bus signals. Indicates the presence of the main bus clock signal
These flash when there is active communication on the PCI bus. 3. Common POST Codes POST Diagnostic Card Pci Pc Analyzer Manual
Before installing, ensure the computer is powered off and you are properly grounded.