Check the listing for details. Internal Motherboard Tester Pro With LCD Screen - PCI Type Interface. Condition: New, Made in China. Listed at 29.50 USD. When the PC is started, the card will indicate a code corresponding to the current error. This code comes from the BIOS self-test when the PC starts up (Power On Self Test - POST). The richness of the teaching will therefore be proportional to the richness of the motherboard self-test, depending on the type of BIOS and its generation. LCD screen: Indicates the code, and if known, its meaning (in English). The display of 'no debug code' indicates that the card is not working: check the CPU and power supply. The display FF or 00 at the end of scrolling means that all tests are positive, if the tester blocks from the start, without scrolling, on FF or 00, this may mean that the CPU or power supply has a fault. The display "Final code:- -" and "Upper code:- -" means that the card is out of s.