Simultaneous display/multi-display does not work. Make sure that you turn on the external monitor before turning on thecomputer. Press the Fn+F9 hot key to toggle through the display options or changethe settings in Display Properties in Windows.Hardware Device ProblemsThe computer does not recognize a newly installed device. The device may not be correctly configured in the BIOS Setup program.Run the BIOS Setup program to identify the new type. Make sure if any device driver needs to be installed. (Refer to thedocumentation that came with the device.) Make sure if the device needs any jumper or switch settings. (Refer tothe documentation that came with the device.) Check the cables or power cords for correct connections. For an external device that has its own power switch, make sure that thepower is turned on.Hard Disk Drive ProblemsThe hard disk drive error message appears on the screen. The hard disk drive has defects. Ask your dealer for help.The hard disk drive operations seem slow. The data files stored on the hard disk drive may be fragmented. Use atool such as Window’s Disk Defragmenter to defragment the files.The hard disk drive in-use indicator glows without blinking. The data files stored on the hard disk drive may be fragmented. Use atool such as Window’s Disk Defragmenter to defragment the files.