What's a POST card? If you don't know or think it's something you send in the mail without an envelope, just answer, No.
Seriously, POST is short for Power On Self Test. POST cards are devices that plug into computers and are used to determine why the computer will not start properly. Most POST cards are designed for desktop computers and plug into one of the PCI slots inside the computer's case. A laptop POST card is designed specifically for, well, laptops.