USB 2.0 PC Diagnostic POST Test Card
The card is named POST (Power On Self Test) card too. It could display the error code by the result of POST. then you would soon determine the error in error code cable. Especially when the PC can't boot operating system, or blank screen, or the card and card and motherboard couldn't issue an audible beep. It is a powerful diagnostic tool.Now just use it, you will get twice the result with half the effort.It is easy to install without opening the computer, it could work by using the 25 pin parallel printer port and USB port for power.Dimensions:2.2 in x 2.13 in x 0.59 in