Should flash briefly for about half a second when the system is powered on or reset. If it stays lit, the motherboard is stuck in a reset state.
These flash when there is active communication on the PCI bus. 3. Common POST Codes POST Diagnostic Card Pci Pc Analyzer Manual
Newer combo cards may use Mini PCI , Mini PCI-E , or an LPC header connection. Should flash briefly for about half a second
Insert the card into an available PCI or ISA expansion slot. For PCI slots, the card is keyed for correct orientation. For PCI slots, the card is keyed for correct orientation
These should remain lit constantly. If an LED is dark, it suggests a power supply failure or a short circuit on the motherboard.
Before installing, ensure the computer is powered off and you are properly grounded.
when it comes to diagnosing. and repairing old computers. there are a number of standard tools that should be in anyone's arsenal. YouTube·Majenko Technologies PCI POST PC System Diagnostics Test Card - StarTech.com