The Clock Time and/or the Date in your PC Is Incorrect
Set the clock time and the date in the setup menu.
Press <F2> to call setup when booting the computer.
The battery is dead if the clock time and the date are still incorrect after you switch
off your PC and switch it back on again. In this case, please contact your technical
USB-Device does not Function
The USB port is not recognized by the operating system. It is only supported by
Windows Me, Windows 2000 and Windows XP at the present time. In addition, the
BIOS setup can be controlled by a USB keyboard.
SIMATIC Box PC 840 Manual