Security device drivers..............................................................................................................................................94Software device drivers............................................................................................................................................ 95Human Interface Device drivers...............................................................................................................................95Firmware..................................................................................................................................................................... 957 Troubleshooting........................................................................................................................................... 96Dell Enhanced Pre-Boot System Assessment — ePSA diagnostic 3.0.................................................................... 96Running the ePSA diagnostics................................................................................................................................. 96Preboot blinking power button codes........................................................................................................................... 968 Contacting Dell........................................................................................................................................... 1016 Contents