Infopackets Reader Steve T. Writes: ' Dear Dennis, I have recently added a 120GB external hard drive to my Dell Dimension computer (via the USB port). Problem: whenever I turn my computer on (to start Windows), the external hard drive always tries to boot first. The computer may boot correctly with the external hard drive connected if USB Legacy Support is disabled. USB Legacy Support enables the computer to use USB peripherals without running operating system drivers and can cause the system to hang on boot when an external hard drive is connected. USB Legacy Support can be turned off through the BIOS. Mar 18, 2012 - The solution is to change the boot order in your computer's BIOS so that it looks at the hard disk before USB devices or doesn't look at USB.