This section will walk you through pre-installation hardware setup, if any, that you will need to do prior to installing &debian;. Generally, this involves checking and possibly changing firmware settings for your system. The firmware is the core software used by the hardware; it is most critically invoked during the bootstrap process (after power-up). Known hardware issues affecting the reliability of &debian-gnu; on your system are also highlighted. &bios-setup-i386.xml; &bios-setup-powerpc.xml; &bios-setup-sparc.xml; &bios-setup-s390.xml; If you have no AT-style keyboard and only a USB model, you may need to enable legacy AT keyboard emulation in your BIOS setup. Only do this if the installation system fails to use your keyboard in USB mode. Conversely, for some systems (especially laptops) you may need to disable legacy USB support if your keyboard does not respond. Consult your main board manual and look in the BIOS for Legacy keyboard emulation or USB keyboard support options. Some OldWorld Powermacs, most notably those with the control display driver, may not reliably produce a colormap under Linux when the display is configured for more than 256 colors. If you are experiencing such issues with your display after rebooting (you can sometimes see data on the monitor, but on other occasions cannot see anything) or, if the screen turns black after booting the installer instead of showing you the user interface, try changing your display settings under MacOS to use 256 colors instead of thousands or millions.