Reference number: CH000298

USB devices not working or being detected in Safe Mode or MS-DOS.

Issue:

USB devices not working or being detected in Safe Mode or MS-DOS.

Cause:

No legacy support.

Solution:

For a USB device to work in a Real Mode environment (MS-DOS) or Safe mode in earlier versions of Windows, USB legacy emulation drivers must be installed and/or Legacy USB support must be enabled in CMOS.

Some computer / motherboard manufacturers may have Legacy USB support or USB Keyboard Support in CMOS and by default this option is generally disabled. If this option is present, ensure that it is Enabled if you wish to enable Legacy USB support. Additional information and help with entering the CMOS setup can be found on document CH000192.

Note: Enabling the option in CMOS This option will only support computer keyboards and mice, without additional drivers. Other USB devices such as printers, CD-ROM drives or any other devices may also require additional DOS drivers to be fully detected.

If you are unable to locate this option in CMOS or to obtain legacy drivers for your USB device, contact the computer or hardware manufacturer.