Control panel message Description Recommended action403-Serial Port D Address Conflict Detected Both external and internal serial ports areassigned to the same resources.1. Remove any serial port expansion cards.2. Clear CMOS. (See Password security andresetting CMOS on page 125.)3. Reconfigure card resources and/or runComputer Setup or Windows utilities.419-Out of Memory Space for Option ROMs Recently added PCI expansion card contains anoption ROM too large to download during POST.▲ If a PCI expansion card was recentlyadded, remove it to see if the problemremains.41A-Front USB1/USB2 Not Connected Front USB cable has been detached or unseatedfrom system board.Reconnect or replace front USB cable.41B-Device in PCI Express Slot Failed ToInitializeThere is an incompatibility or problem with aPCIe device and the system or PCIe link couldnot be configured to a valid bus width or speed.Try rebooting the system. If the error reoccurs,the device may not work with this system43A-USB Type-C I2C Not Connected Cable is required between I2C on card and USB-C on the system board.Install cable between I2C on card and USB-C onthe system board.43B-More Than One USB type-C Cards AreInstalledMore than one USB type-C card is installed. Remove USB type-C card so only one isinstalled.500–BIOS Recovery A system BIOS recovery has occurred. Not applicable.70x-Wireless Mode Not Supported The system has detected a wireless moduleinstalled in the system that is not supportedand has been disabled.Replace with a supported module.800-Keyboard Error Keyboard failure. 1. Reconnect keyboard with computerturned off.2. Check connector for bent or missing pins.3. Ensure that none of the keys aredepressed.4. Replace keyboard.801-Keyboard or System Unit Error Keyboard failure. 1. Reconnect the keyboard with computerturned off.2. Ensure that none of the keys aredepressed.3. Replace the keyboard.4. Replace the system board.900-CPU Fan Not Detected CPU fan is not connected or may havemalfunctioned.1. Reseat CPU fan.2. Reseat fan cable.3. Replace CPU fan.901-Chassis, Rear Chassis, or Front Chassis Fannot DetectedChassis, rear chassis, or front chassis fan is notconnected or may have malfunctioned.1. Reseat chassis, rear chassis, or frontchassis fan.2. Reseat fan cable.3. Replace chassis, rear chassis, or frontchassis fan.903-Computer Cover Has Been Removed SinceLast System StartupN/A122 Chapter 7 POST error messages and diagnostic front panel LEDs and audible codes
