Diagnostic Card, also named Post Card and Debug Card .It catches the BIOS post code ,then display on digital LEDs, you would soon determine cause of the error by error codes table . Especially when the PC can't boot operating system, or it is a black screen, or the card and motherboard couldn't issue an audible beep. It is a powerful diagnostic tool. Now just use it, you'll get twice the result with half the effort.
Soarland SLDC010 4-Digit PCI/ISA Motherboard Diagnostic Debug Card can fit for both PCI connector motherboard and ISA connector motherboard.