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1turn off your dell dos not mether what order is. Press "F2" as soon as the LEDs first blink on your keyboard. F2 must be pressed before your operating system starts to load. If you miss your chance, start over and try again. after find the menu named : boot order and put the first one wich one you want .save ,exit and there you go
Turn On Your PC Have you ever noticed the messages
that pop up on the screen as soon as you turn on your PC? These messages
tell you a key combination you can press to enter "Setup" or the
"BIOS." Watch your screen and see if you can read what keys to press.
the Keys to Enter Setup Mode If you did not see a message
telling you what keys to press, try tapping the following possibilities
as you turn on the machine:
pressing Esc or other key, you will most likely
see instructions telling you how to enter "Setup Mode". Follow those
On some computers, you
must hold down the key before you press the power button to
turn on the computer. For example, if you are converting a Toshiba
laptop to a Linux Workstation, you must hold down the Esc
key and then press the power button. The computer then asks you to
press F1, and you can then set the "Boot Priority."
the Arrow Keys, Choose the "Boot," "Boot Order," or "Boot Priority"
Option The menu of choices you see will be different for
different kinds of computers. Remember that the choice you want is the
"Boot" order or "Boot Priority." On some computers, this is called the
"Start Up Options" or "Start Up Sequences." You are going to change
where the PC will look for boot information when it starts up. (CD-ROM, HARD DRIVE/HDD, LAN, FLOPPY, USB). If you wish to boot from your Hard drive, then select it as your First Priority.
Using the instructions on the screen, save your settings and start up
your PC. The PC must boot from the HDD. Regrds
Power on your system, Press F2 on Dell logo. This would take you to system BIOS. Ensure that USB controller is ON, and USB emulation is also set to ON. Save settings and Exit. System would reboot now. Press F12 on Dell logo, and select USB ROM as the boot device. This should boot your computer through your External drive. If it still doesnt work, try switching to a different USB port. If none of these steps work, it may be a problem with the boot sector on your External drive.
Sounds to me as if there is a power on password set, can you get into the bios? try pressing <delete> or F2, if it asks for a password then you will need one to access the CMOS, within the CMOS is an Administrator password as well as a power on or user password, those have to be cleared in order to boot or the proper password entered at start up in order to continue the boot process