A POST test card is a small diagnostic tool that displays error codes generated during the Power On Self Test
These errors, called POST codes, correspond directly to a test that has failed and can help determine what piece of hardware is causing an issue.
Most POST test cards plug directly into expansion slots in the motherboard while a few others connect externally via a parallel or serial port.
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Also Known As: Power On Self Test card, POST card, POST diagnostic card, checkpoint card, port 80h card
Examples: "My computer wouldn't turn on all the way so I used a POST card and found out that my CPU was having issues. I replaced my CPU and everything was fine!"