The Star Tech.com PCI Post Diagnostics Card makes troubleshooting PC problems easy. Simply plug the card into a PCI slot on a malfunctioning PC, & the card reports any problems in the form of error codes on its LED display. These codes are then cross-referenced to the enclosed error code chart to pinpoint the cause of the problem. PC technicians & system builders can save hours of troubleshooting time & prevent non-defective parts from being replaced