Dell XPS 720 Black Owner's Manual - Page 68

Light Pattern Problem Description Suggested Resolution A possible expansion card failure has occurred. 1 Determine if a conflict exists by removing an expansion card (not a graphics card) and restarting the computer (see "Removing PCI and PCI Express Cards" on page 95). 2 If the problem persists, reinstall the card you removed, then remove a different card and restart the computer. 3 Repeat this process for each expansion card installed. If the computer starts normally, troubleshoot the last card removed from the computer for resource conflicts (see "Troubleshooting Software and Hardware Problems" on page 83). 4 If the problem persists, contact Dell (see "Contacting Dell" on page 179). Another failure has occurred. • Ensure that all hard drive and optical drive cables are properly connected to the system board (see "System Board Components" on page 89). • If there is an error message on the screen identifying a problem with a device (such as the floppy drive or hard drive), check the device to make sure it is functioning properly. • If the operating system is attempting to boot from a device (such as the floppy drive or optical drive), check system setup (see "System Setup" on page 166) to ensure the boot sequence is correct for the devices installed on your computer. • If the problem persists, contact Dell (see "Contacting Dell" on page 179). 68 Troubleshooting