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.
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
Insert the card into an available PCI or ISA expansion slot. For PCI slots, the card is keyed for correct orientation.
These flash when there is active communication on the PCI bus. 3. Common POST Codes POST Diagnostic Card
Most cards feature a bank of LEDs that indicate the status of critical power rails and bus signals.
