Sorry but basically you cant access command propmt through the bios. The command prompt is part of the operating system of the pc, either as DOS (disk operating system) or part of windows.
The BIOS (Basic Input output system) which is on a rom(read only memory) chip on the mother board, and initiates post(power on self test) when the computer starts, without the bios the computer would not boot up at all. To access the command prompt you must have a operating system installed, ie Windows. hope this helps.
1. Check your BIOS to be sure your computer will boot from a CD.
Enter the BIOS setup by pressing the "Delete" or F2 or "F12"
key, or as directed at the startup screen, immediately after booting. Set the
first boot device to "CDROM" or "DVDROM" instead of
"hard drive" if it isn't already.
2. MS-DOS command prompt
Insert the Windows XP installation CD into your CD or DVD drive
and restart the computer. When prompted, choose to start from the MS-DOS
command prompt with CD support. The MS-DOS command prompt will appear in a
moment.
3. Start SMARTDRIVE by typing "SMARTDRV" at the DOS prompt
and pressing enter. You don't have to run SMARTDRIVE, but copying the files
will be much quicker if you do. The computer will display the DOS prompt again.
4. Enter "CD I386" at the DOS prompt to change to the
directory where the setup program starts.
5. Enter "WINNT" at the prompt to start Windows XP setup.
The installation program will copy files to your computer and then display a
message requesting to reboot.
6. Press the "Enter" key to reboot. The setup program will
start again and check that your hard drive format is compatible with Windows
XP. If not, it will guide you through partitioning and formatting the drive and
then ask you to reboot once more.
7. Press "Enter" to reboot. The computer will restart in Windows XP mode and automatically start the Windows Setup Wizard to detect your hardware and finish the installation.
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