ITEM NAME:4-Digit Card Pc Analyzer Computer Diagnostic Motherboard Post Tester For Pc D6P9 4-Digit Card Pc Analyzer Computer Diagnostic Motherboard Post Tester For Pc D6P9 CLK: No matter ISA or PCI, as long as there is a empty board (no CPU etc.), the light should be on when power on, otherwise, the CLK signal is failure BIOS: Motherboard running, the light will fash while there is a reading operation on the BIOS. IRDY: The light will flash when having a IRDR signal, otherwise, it will not lignt on. OSC: Empty board
