This reliable PCI Post Card is the perfect diagnostics tool for pinpointing Power On Self-Test problems. A definite time saver, the PCI Post Card is easy to install and delivers simple PC diagnostics in the form of error codes on the built-on LED display. Determining the computer problem is then as simple as referring to the error code chart that's included with the PCI Post Card, eliminating unnecessary troubleshooting steps and preventing non-defective parts from being replaced. Backed by Lifetime Warranty and free lifetime technical support, StarTech.com's PCI Post card is designed and constructed to provide reliable computer diagnostics. Please Note: You may have to refer to your motherboard manufacturer's manual for motherboard specific error diagnostic codes when using the PCI Post card.